Booster Pump Issues - Toyota FJ Cruiser Forum
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post #1 of 11 (permalink) Old 06-18-2013, 06:05 AM Thread Starter
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Booster Pump Issues

So I have been having the same problem with my booster pump as described in this post: https://www.fjcruiserforums.com/forum...oise-help.html

I have noticed that the booster pump runs consistently every 10 seconds and runs for 1 to 2 seconds each time. It runs like this if the car is running and/or if I just have the key on without the engine running.

The screech noise has begun to happen less frequently but I can still hear a slight hiss after the pump runs.

Does anyone know how often this pump should run and if the hiss is normal?
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post #2 of 11 (permalink) Old 06-19-2013, 02:07 PM
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Re: Booster Pump Issues

something is leaking thus not holding the vacuum. as a result the pump is running constantly trying to regulate the vacuum so you have brakes. check all the hoses make sure nothing is torn or loose.

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post #3 of 11 (permalink) Old 06-19-2013, 02:16 PM
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Re: Booster Pump Issues

^^^ and fix soon as you could eventually kill the pump if it's constantly running.


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post #4 of 11 (permalink) Old 06-19-2013, 02:19 PM
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Re: Booster Pump Issues

Is it possible you just need to bleed the brakes? Might be worth a try for the hell of it....


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post #5 of 11 (permalink) Old 06-22-2013, 08:28 PM Thread Starter
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Re: Booster Pump Issues

Thank you for the replies.

The screeching noise is back but still no issues otherwise. I have bled the brakes and there was no air in the system. I also bled the accumulator and it made no difference.

I've searched for leaks and there is nothing apparent. Level in the reservoir has never changed, other than a little from the bleeding.

Is it possible that a check valve is bad, allowing the pressure that the pump builds up to bleed back through? If so, any ideas on how to fix/replace it without buying the entire $2k unit?
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post #6 of 11 (permalink) Old 07-01-2013, 08:10 AM Thread Starter
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Re: Booster Pump Issues SOLVED

Thanks to all those who made suggestions to this post, although overall I am disappointed in the lack of technical response on this entire blog.

I did solve the problem. The accumulator was bad. I found an OEM replacement online for $300. It took about 5 mins to change myself and I didn't have to bleed anything. It was no more difficult that changing the oil filter.

The dealer told me that the accumulator itself was not available as a replacement part and the entire booster assembly. $3K with labor!!!
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post #7 of 11 (permalink) Old 07-03-2013, 01:12 AM
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Re: Booster Pump Issues

As Jasonfjc stated, I too think that there might be leakage and therefore will not be able to hold the vacuum. As a result the pump is running constantly trying to regulate the vacuum so you have brakes.
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post #8 of 11 (permalink) Old 07-03-2013, 08:19 AM
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Re: Booster Pump Issues SOLVED

Quote:
mjr374 previously said: View Post
Thanks to all those who made suggestions to this post, although overall I am disappointed in the lack of technical response on this entire blog.

I did solve the problem. The accumulator was bad. I found an OEM replacement online for $300. It took about 5 mins to change myself and I didn't have to bleed anything. It was no more difficult that changing the oil filter.

The dealer told me that the accumulator itself was not available as a replacement part and the entire booster assembly. $3K with labor!!!
Good for you, nobody is going to work on your vehicle like you would. Goes to show how much the dealer really knows. As far as knowledgeable people on this forum there's plenty that have helped me over the last 7 years. I never even heard of your problem before but I'm glad you fixed it yourself and shared it with the rest of us.

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post #9 of 11 (permalink) Old 10-02-2019, 08:04 AM
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Re: Booster Pump Issues

Bumping a really old thread. I have the same issue with my booster constantly running. If the OP is still on here, did replacing the accumulator resolve the problem in the long term?
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post #10 of 11 (permalink) Old 10-02-2019, 09:05 AM
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Re: Booster Pump Issues

Quote:
VooDooBlueATL previously said: View Post
Bumping a really old thread. I have the same issue with my booster constantly running. If the OP is still on here, did replacing the accumulator resolve the problem in the long term?
After his last post, he's never returned. Last Activity: 07-01-2013 07:10 AM

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