Prius (2004-09) :: Scraping Sound When In Motion - Brake Fluid Actuator Pump Replacement?
Feb 19, 2014
My 2007 Prius (151,000 miles) just started making what sounds like a scraping sound when in motion. This does not happen every time I drive it. The dealership said I need to replace the brake fluid actuator pump.
He couldn't really tell me what would happen if I don't have it fixed. He said perhaps the power brakes would go out, or maybe the anti-lock brake system. Either way, I don't want to mess with possible brake failure. But the cost of this repair is so high, and my car already has 151,000 miles. I'd love to drive it to 300,000 miles if I can, but am I being realistic? I'm wondering if it's worth investing this much money in a car with so many miles.
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1999 CR-V with 70k miles. Just noticed a slight constant scraping sound when car is in motion. I had a friend drive the car in a tight circle around me while I stood in a parking lot and was able to isolate the sound to the front right wheel. Sounds like a caliper dragging on the brake disk. Brake pads have plenty of meat left on them. So far, these are the possible causes I can think of:
caliper piston sticking in bore
caliper not sliding freely on caliper pins
brake hose restriction not allowing piston to retract
I had never heard of a brake hose restriction not allowing a piston to retract, but I just read an online forum comment where someone was having a similar problem, and someone else said it was possible for an old brake hose to look fine on the outside but be swelled on the inside, thus restricting fluid flow. And can something like a stuck piston be remedied with grease, or does the whole caliper have to be replaced?
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I have noticed that when I open the door to the driver's side after the car has been sitting overnight that the pump noise is longer than half a year ago when i bought it used. It used to last for max. 3 or so seconds, and now it takes 5-10s - depends. I can get into car and almost get it into ready and then it ends.
Also, every second or third time i press the brake (normal, like when stopping gently) i can hear the sound of the pump for around 2 seconds. I don't remember that happening before so is this or isn't normal?
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2003 - I tried to change the brake fluid with a MityVac. I've done it to dozens of cars with no problem. With the Prius it didn't take it well as I have to pump the pedal sometimes to stop or the pedal goes way down. Only now I read about how a special Toyota scan tool is recommended to do it. Is there any other way? I only really did the front brakes since after trying one rear wheel cylinder and getting nothing out of it, I quit. The dealer wants $165 and I'm sure that doesn't include any extra shop fees and such they tack on. What other way can I try before taking it in?
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A few weeks ago, I received the triangle light in my 2007 Prius with 125k miles on it. When I took it to the dealer, they said that the hybrid battery needed to be replaced. A new battery was ordered & installed by the dealer, which took a couple weeks as the battery wasn't in stock. When I picked up the Prius this week, within driving it a couple miles, it was apparent the A/C wasn't working. I took it right back to the dealer who said they'd look into it. When the Service sales guy started it again, it made a very strange noise as well, which it never did before. The dealer has come back and said that not only has the A/C Compressor out but the ABS actuator is also failing. They are saying this has nothing to do with the battery replacement but both these items were working fine before having the battery replaced
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2007 Prius here. A few months ago I had a similar problem. Basically when putting my hand on the door sensor, the doors would cycle through unlocking (noise, lights flash etc) without actually unlocking. If I keep pulling the handle after each attempt it seems to go forever.
The front passenger door also did not lock under any circumstance.
Took it into Toyota, they absolutely screwed me I now realize, $900 to replace a door actuator in that passenger door.
Worked fine for a few weeks. Then all of a sudden, problem started again. Just like last time, slowly slowly over the course of 2 months, it got worse and worse until today I could not open the driver side front or rear door at all.
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The dealer told me my actuator and solenoid failed. I have a 2009 and less than 60,000 miles. I believe there is something wrong with those parts and they shouldn't fail at two years old. What do you all know about this?
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The brake actuator on our 2006 Prius (95K miles) was activating (pump turned on) every 20 seconds or so. I used AutoEnginuity (AE) software to monitor the pressure of PACC (accumulator pressure sensor) and the pressure dropped rapidly once the sensor voltage got up to around 3.1 volts; therefore, the pump would activate again and this cycle would keep repeating as long as the Prius was turned on. Therefore I decided to replace the brake accumulator and its associated resistor. I purchased a new brake actuator and its associated resistor from Toyota. The brake accumulator replacement went well but when I tried to locate the resistor to replace it, I was dismayed to see that the old resistor is very hard to access (even though I took most of the dash apart to find it).
In my 2006 Prius, the resistor is on the driver's side near the body and high up under the dash. I think I understand the reason for matching the resistor value with the resistance of the pump windings but I am going to use the old resistor and see how noisy the pump is. BTW I referenced Toyota website (TIS) for how to do the replacement procedure and now I am going to see how good AE software (latest version) is at bleeding the various components. This is FYI when replacing the brake actuator and wanting to know where this resistor is located and how difficult it is to access.
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On my 2011 Prius maintenance schedule, there is plenty of direction about inspecting brakes; however, there is no indication of when to flush and replace the brake fluid. My wife travels 60 miles/workday, but hits her brakes about 6 times/day. I would expect that normal braking would result in pad replacements more regularly than we are going to have. I did most of the 60K inspection, but took the car to a trusted, local mechanic for undercarriage inspection and a professional look-see. They indicated that the brake fluid should be replaced every 3 years, and I OK'd a flush and refill. Is there any professional guidance on the replacement interval? I know there are a lot of opinions, but I wonder if there is any published authority.
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My 2007 LS 460 makes a noise like a pump pulse sound during braking. When I step on the brake before coming to a stop there is no noise but once the car is 20 feet before coming to a complete stop at times you feel and here a pulse or pump or vale sound in the front engine area. Sometimes as I increase pressure on the break pedal a little harder you can feel and here a single pule and at times 3 or 4 valve or break pump sound. What might be going here? I am certain the sound is not coming from the wheel area. It is definitely under the hood. Could it be a faulty load sensing proportioning valve or booster?
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For several days I could hear a scraping sound from the right front side. I thought it was snow packed in the wheel well at first, until there wasn't any snow there. Today I was driving on the Xway and the scraping became a buzz like a Cessna airplane. On the way back home I turned the steering wheel back and forth and sure enough the buzz came and went. That made it sure to me the wheel bearing was bad.
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I know I need to remove the reservoir to replace the pump but I can't get it out. I removed the storage compartment, then the bolt connecting the translucent top portion of the reservoir that connects to the front and the side bolt that connects the reservoir to the side of the truck. It is loose but I still cannot get the reservoir out.
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I recently purchased an 08 ls 460 and started noticing the infamous clicking sound coming from the ABS brake actuator under the hood. A $3000plus fix that is not in the budget nor will it ever be!..After doing some research trying to figure out what the actuator does i stumble across this Lexus technician PDF ...
..It clearly states on page 2 that "If a Toyota ABS system malfuctions, normal braking will not be affected!...My worry has never been the sound it makes,.. but that of me not being able to brake when needed!!...
[URL]...
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Proud owner here of a '96 3.0L RWD Aerostar Utility Van with about 138k miles, and leaking power steering fluid. At this point I'm replacing fluid from zero every time I have to drive it which is about once a week. I've located the leak and it seems to be coming from the pump/reservoir around the pressure hose. The hose is loose as in i can move it around a bit, but from what I've read, this is normal and the hose is supposed to be like that. I figure that at this mileage, with so much air going through the pump, all the crazy squealing and whining it does even when full, at this point it probably makes sense to replace the whole pump while I'm in there, as opposed to just doing the reservoir. Anyway, I'm planning to do this in a couple of weeks, and have some questions...
1) The pump - I've read on this forum that the best way to go on brand of the pump is Motorcraft.
2) Hoses - I'd like to replace the hoses coming out of the pump while I have this thing all taken apart, but I'm not exactly sure what parts to get. I know one is the pressure and one is the return, but there are variations of each based on the research I've done. The parts on the Napa site have different descriptions like "with switch port", "without switch port" "56in hose" "26in hose", and so on. Which ones I need, specifically the ones connecting directly to the pump? I havent been able to find anything in my research online, in Haynes, or Chiltons manuals.
3) Washers - Whether or not I replace the hoses, should I replace the washers at the connection point? Chilton's seems to recommend replacing them. Will they come with the new pump?
My local auto parts shop has the pulley remover/installer for me to rent so I've already got that squared away. I'm pretty sure I've covered all of my bases otherwise.
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I have worked on several minor to moderate engine issues over the years with various brand cars so I was thinking about replacing my leaking main water pump (not the Hybrid pump).
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I have a 2008 Prius T6 that I took in for routine oil change at Big-O tires. They called and said water pump was leaking badly.
Pump replaced 2 hours later, but they cannot "burp" car because it won't start. The hybrid battery is apparently too low (1 purple bar) and after repeated attempts it's dead (one vertical bar on display). I've never seen this happen before... I've seen the car battery die (after leaving lights on) but the hybrid battery has never gone low.
Big-O calls and says,
(1) We've replaced pump before and never seen this happen
(2) We called Toyota and there is only one high-voltage charger in the region... we don't know where
(3) Toyota said nothing is wrong with the car, it just needs a charge
(4) Toyota said we did nothing wrong
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After a long day at work, I stepped out of my '06 Prius and was greeted by an obviously struggling CHRS pump. It sounded like it was having a hard time maintaining speed, and to my ears was screaming; better replace soon...
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Driving last night, I heard this horrible scraping sound from time to time, but I couldn't stop right away. When I got home, I saw that the bottom cover (or whatever the proper name for it is) had come loose at the left front -- I assume from hitting the ground once too often (damn this low clearance). I took a pic, but it's not too clear. The front edge is frayed a bit.
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I purchased a 2008 Prius with 117,000 miles lat month. I took it to a friend's house recently. When he was looking at the car, he told me that my coolant level is low and put some coolant in the reservoir. The next day when I was driving the car I was hearing a rattling sound every time I pressed on brakes. I could not figure out what could be the reason. The sound went away after couple of days. Today I was going through the manual and noticed the place where my friend put coolant in is actually brake fluid reservoir. It looks a lot like coolant reservoir of my other car. So now I am wondering what could happen if coolant goes into brake fluid reservoir. Will it harm my brakes? It has been about 2 weeks since that incident happened.
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Hearing non-stop Pump sound ??
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I was advised to replace my brake and power steering fluild at 40,000 by the Chrysler Dealer. Ever heard of this?
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