Prius (Gen 3) :: Brake Pump / Accumulator And Actuator Running More Frequently Than Before
Sep 3, 2015
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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During the last week, or slightly less I suddenly started hearing the brake boost pump running much more frequently than normal in my 2008 and is also producing a "knocking" noise along with its run noise which increases in frequency as the pump speed increases. No problems with the engine coolant pump for the thermos, and the inverter pump was replaced yesterday along with a replaced "bolt" in the steering column for the recall.
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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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I have an '01 Prius with ~80,000 miles now. I bought it with a known brake issue, however upon further diagnosis, it appears the problem is with the Brake accumulator.
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Okay, quick run down;
2004 prius
Brake sensors, all 4, changed
Accumulator changed
Still throwing codes even when reset by dealer. They have bled the brake lines 5 times, reset codes and still throwing codes.
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On our 2008 Prius, while the brake assist pump is running I get a steady thump-thump-thump-thump noise, as shown in the video below. If you put your foot on the brake the noise stops. The brakes operate fine and there are no warning lights on. What this might be? It's coming from the passenger side of the car, and oddly it's loudest under the car near the back seat. 86,000 miles on the car.
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I used to get great MPG's in the beginning (>57 MPG in summer) that deteriorated as the engine started to run longer and more frequently after what I suspected to be a faint bump against a garage wall in the front. This was several months ago. I have since been averaging about 47 MPG overall (averaging winter, summer out). I forgot about the bump incident until last week when the engine suddenly started running shorter and less frequently. This lasted for a week or so, with no significant changes in the weather/temperature. And then inexplicably, it has started to run longer and more frequently again. By "more frequently", I mean when I bring ICE on, it doesn't easily quit, regardless of my prodding it to quit by going into regen momentarily. Also, the initial warmup is longer.
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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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The wife's 2003 GX470 has some brake issues. High pitched whine and ABS and Brake lights went on, so I took it to my local lexus dealer which is 50 miles away. Anyway, the recommendation is to replace "brake booster" and "accumulator" with brake system bleed.
Then, says "may need master cylinder after that, will not know until that is completed
Then goes on to need timing belt, water pump due to miles (97K)
CV boots
Driveline service
[URL]..................
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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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2003 with about 140k miles, radiator was replaced a couple years back, recently replaced timing belt (#2) and some valve cover gaskets in advance of a road trip.
On the road trip, used no cooling air, occasionally used heat at night with the roof down. At one point, I thought I heard my engine louder than normal, but decided it was actually machinery nearby.
The next morning, after only about 1 hour of leisurely driving through a civil war park for about an hour, I confirmed that in fact it was my vehicle making the noise.
It was fairly frequent, and basically sounds and feels (hand on air filter) like the blower kicking on, as if to cool the car off.
But the air temp was cool, the car temp was solid and cool, so there wasn't a good reason for this to be happening.
Because I had just had the timing belt & such done, I stopped at a dealer. The engine light came on as I pulled in.
They indicated that they saw a MAF sensor failure, and that while it needed to be replaced, it wasn't a problem to finish my road trip. They indicated the check engine light was related and also ok to drive with. They then lost a lot of credibility when they tried to ask me if perhaps the AM radio was the noise I was hearing...
Despite that, I continued on (had to be somewhere and they said it was ok to drive). The engine light actually went off the next time I filled up, so I decided perhaps that was actually a gas cap pressure issue (saw that once before in my ~6 years of driving the car).
Back at my home Toyota shop, they confirmed the MAF replacement need, and have also suggested spark plugs (fair enough).
But re: the air, they don't believe it sounds 'wrong'. I agree with that- it sounds 'right', as in when the blower kicks on, and I vaguely recall that it was something I heard back when my radiator actually rusted out / failed.
My issue is that it seems to be happening MUCH more frequently than normal.
So while I don't recall hearing it at all over the past couple years or only on very rare occasions under load, or when the radiator failed, it seems to be almost routine now, where at a given stop light (even in just a few miles of driving in town at low speeds), I'll hear the extra noise.
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My 05 was running rough and misfiring quite frequently. After much deliberation, I took it in for a diagnostic hookup. The dealer said my driver side cat was clogged. Lucky for me, I was just under the warranty period(79673 miles). I have had it replaced and I can feel a noticeable difference in the way it runs. Could a clogged cat have made it run that poorly or am is it just in my head that it is running alot better?
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Last week my ABS warning light came on. I took it to a mechanic (who I trust but is not a Prius-specific mechanic) who said warnings are coming up for the anti-lock accumulator and hydro boost motor. However, in July 2011 I had these both replaced. The work was done by a Toyota dealership. I ended up taking my car back 4 times after this work was completed as it kept having braking issues. They replaced the shim kit and bled the brakes. And eventually they replaced the master cylinder (this they did under warranty bc there was no way I was paying them any more money). At no point did they seem to understand what they were doing. (Along the way they broke my windshield and killed my battery.)
Finally by November 2011 my car was driving normal again. And then the warning light and high-pitched alarm went off again last week. I talked to Toyota Corporate who suggested I call the dealer to do the work since technically the accumulator and motor just ran out of their one year warranty. But this is the same dealer that didn't seem to know what they were doing last year.
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I had the doors open while unloading the car this morning and noticed that the brake booster pump just kept running and running and running, plus I can hear a strange, hollow rattling sound somewhere under the car that coincides with the pump. When I say it runs "constantly," I really mean that it runs for 10 seconds (with the rattle), stops for about 5 seconds (silence), runs and rattles for ten seconds again, stops for another five, and just keeps on going for as long as I care to sit there with the door open.
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Toyota dealer said computer indicated the water pump and belt needed replacing. We decided to do the replacement ourself. Now the light comes on which indicates car is running hot. We did replace the coolant. The 2005 Toyota Prius never ran hot before the replacement, What did we do wrong?
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Just curious-- After several hours of not running, I open the driver door and hear a pump of some kind start up and run under the hood. Runs for a while then stops. How long seems to depend on how long the car has sat there, but about 30 seconds max. What it is?
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I know that the brake actuator on the early LS460s has an issue. How do you know it's actually failed or is failing?
Do the brakes stop working?
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I have searched and heard a lot about the brake actuator problems... but the noise I get is not a clicking noise.
My brakes have a noise when i press the brake all the way down and release it quickly... but its much more of a quick "scrubbing" noise... .almost a "creaking"... is this the brake actuator? or something else? I just recently got new pads and rotors at NTB... and the sound seems to have come after the install. i took it back in and they said they had no clue. Also , they did bleed the brakes when they installed new pads and rotors...
The noise really only happens when the car is in gear lunging. In park it happens one in 10 times as opposed to every time in gear.
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i have a 2010 Prius II that had a recall in 2013 on the brake boosted. I had a new booster pump put on and now three years later it has brake fade again. I am told from the dealer that it will cost 1800 to repair. So how long does a recall last.
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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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