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Ontario Local discussions for those in the Ontario, Canada area.

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Old May 17th, 2020, 07:50   #1
Muggins
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Default Power brake assist missing and hissing

So I read the threads to educate myself on loss of power brake assist and hissing when brake pedal is depressed. I took off the vacuum hose from pump to brake servo, examined it, epoxied what looked like cracks, and re-installed, without success. Also examined the check valve and small vacuum hose take-off from it, which looks normal. Still no power assist. I'm hoping against hope that it's NOT the brake servo.
Any advice on correcting this issue?
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Old May 17th, 2020, 11:27   #2
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first i would replace your vaccume lines then perform a brake booster test. you should be able to depress the petal once or twice with the car off. you might have a bad brake booster. they do fail. had one go and you loose power breaks and have to double foot the petal to get any breaking force. even with a leaking line you should have some power assist.
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Old May 17th, 2020, 11:49   #3
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I'm having no other performance issues (besides no brake power assist) in terms of engine performance, I get lots of turbo boost, so I don't see the point in replacing ALL the vacuum lines at this point.
My problem is, very difficult braking and I took off the vacuum hose that leads from the vacuum pump to the brake booster. I epoxied a couple of cracks and reinstalled, with no improvement in brake performance.
What I DO notice, is a hissing sound on brake pedal application, which I imagine is escaping air from the servo or the brake servo vacuum hose.
Would a defective brake booster/servo make that kind of hissing noise or is that ONLY characteristic of the vacuum line or check valve?
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Old May 19th, 2020, 11:03   #4
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Quote:
Originally Posted by Muggins View Post
I'm having no other performance issues (besides no brake power assist) in terms of engine performance, I get lots of turbo boost, so I don't see the point in replacing ALL the vacuum lines at this point.
My problem is, very difficult braking and I took off the vacuum hose that leads from the vacuum pump to the brake booster. I epoxied a couple of cracks and reinstalled, with no improvement in brake performance.
What I DO notice, is a hissing sound on brake pedal application, which I imagine is escaping air from the servo or the brake servo vacuum hose.
Would a defective brake booster/servo make that kind of hissing noise or is that ONLY characteristic of the vacuum line or check valve?
yes. it sounds like the brake booster is bad. But maybe we could get oilhammer's input on this. even with a leaky vac line you should have some power assist.

Last edited by DivineChaos; May 19th, 2020 at 11:07.
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Old May 19th, 2020, 11:16   #5
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Watched a youtube video on a vacuum pump replacement for an ALH TDI and the new unit's vacuum nipple was solid in place, did not swivel or move like mine. So I cleaned up the nipple and surrounding area and epoxied it to prevent movement. It didn't help my problem. Still no power assist and I still hear this hissing coming from somewhere around the brake pedal when it's depressed.
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Old May 19th, 2020, 11:32   #6
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Because you still need a brake booster.
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Old May 19th, 2020, 12:48   #7
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Because you still need a brake booster.

New booster costs a fortune and can't seem to source a reman unit. I tried to examine the booster as best I could with a mirror and feeling the bottom and backside for corrosion. Seems pretty solid, no rust or corrosion. I get the feeling it's a seal or o-ring or something like that causing the vacuum leak. Are there no seal kits available to repair the booster?
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Old May 19th, 2020, 13:49   #8
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Go to the scrap yard and get a booster, there are so many mk4s at 3 scrap pull it your self salvage yards in Hamilton, it's hilarious. A booster is like 30 bucks, dirt cheap, and if you happen to have bad luck and get a bad one, all scrap yards have an exchange policy

Just so you get an idea, this 02 beater I just picked up had a leaking rack. I got a complete rack, 2 power steering lines, the reservoir and the power steering pump for 80 bucks. I didn't feel like dropping a subframe and rack on the ground on my back so I found a competent shop that replaced the rack, with alignment, for 280...360 bucks for a rack installed. Reman racks go for 300 alone

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Old May 20th, 2020, 03:23   #9
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Quote:
Originally Posted by Muggins View Post
New booster costs a fortune and can't seem to source a reman unit. I tried to examine the booster as best I could with a mirror and feeling the bottom and backside for corrosion. Seems pretty solid, no rust or corrosion. I get the feeling it's a seal or o-ring or something like that causing the vacuum leak. Are there no seal kits available to repair the booster?

None of this changes the fact that your car still needs a brake booster. Sorry.

Not sure how it is in Canada, but here I can get a brand spanking new Ate booster for less than $200. I would not call that a "fortune", however as pointed out there are certainly plenty of used ones out there. You do need to make sure to get the correct one, as there are some choices based on brand of master cylinder, ESP or not, etc.
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Old May 20th, 2020, 05:45   #10
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Thanks for all those tips, guys!
A new booster from the stealer is $591 + tax.
Aftermarket it's $385 + tax.
The wrecker wants $75 + tax with 90 warranty.
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Old May 20th, 2020, 07:33   #11
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Quote:
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Thanks for all those tips, guys!
A new booster from the stealer is $591 + tax.
Aftermarket it's $385 + tax.
The wrecker wants $75 + tax with 90 warranty.
75 seems expensive but I'm guessing this is one near you that isn't a you pull it wrecker

If you go to something like kenny u pull in hamilton and grab it yourself, it's 24 bucks plus tax. If you take the booster and master cylinder it's 40 bucks plus tax

https://www.kennyupull.com/en/price-list/Hamilton

Anyways for an extra 50 bucks if it's nearby you and you don't have to pull it, it's still a good price

Also, if you want aftermarket, just go to rockauto... cheapest one is 175 plus tax... with shipping you'll likely still come out cheaper

Best of luck
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Old May 20th, 2020, 09:58   #12
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Cookstown Auto, the place nearest me which I called, is a you-pull-it yard, with a booster off-car.
I checked Rockauto's website and they list a reman unit from Cardone for about $250 CAD without core exchange. Their non-ESP booster which is what I need, costs MORE than their ESP-equipped units.
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Old May 20th, 2020, 10:20   #13
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You can try http://dasparts.ca/about.html based in Cambridge. I'm guessing their price will be around the same as Cookstown Auto Wrecker near you.
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Old May 20th, 2020, 13:00   #14
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Quote:
Originally Posted by Muggins View Post
Cookstown Auto, the place nearest me which I called, is a you-pull-it yard, with a booster off-car.
I checked Rockauto's website and they list a reman unit from Cardone for about $250 CAD without core exchange. Their non-ESP booster which is what I need, costs MORE than their ESP-equipped units.
That's really expensive for a you pull it wrecker... But since Cookstown is pretty close to barrie it's probably worth it just in the time you'll save driving all the way to Hamilton and back.

Anyways hope you get your issue solved
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Old May 21st, 2020, 07:34   #15
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Thanks guys.
Taking it to Brandon at DCB Motors in Orillia today to check it. He says he doubts it's the booster. Hope he's right.
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