Brake bleed procedure
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Re: Brake bleed procedure
When you bleed the brakes normally the pistons do not operate and I think the ABS is more or less bypassed.
Join Date: Dec 2018
Location: Indio ,california
Age: 80
Posts: 40
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Join Date: Jun 2009
Location: Fort Worth, Texas
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Posts: 13,448
Received 878 Likes
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684 Posts
Re: Brake bleed procedure
If you have air in the ABS pump then you need a scanner that can cycle the pistons inside the pump to rid it of air bubbles. Some You Tube videos suggest going to a gravel road and getting the ABS to work a few times. I am dubious about that though but ....
When you bleed the brakes normally the pistons do not operate and I think the ABS is more or less bypassed.
When you bleed the brakes normally the pistons do not operate and I think the ABS is more or less bypassed.
On the OTHER Hand, at tech days, while Nick and Zach are bleeding my brakes and putting pads on, I"m fixing sticky keys and working on car audio problems - I have ZERO experience actually working on brakes.
And the ABS system is a bit of a mystery to me........
Re: Brake bleed procedure
What I don't get is why it does it if the car hasn't been driven for awhile? I just bled mine again yesterday because of the soft pedal after doing a complete flush with new fluid awhile back that fixed the problem.
And the last round really didn't improve it much.
And the last round really didn't improve it much.
Re: Brake bleed procedure
I don't get it either. However, it's happened to lots of us. As far as bleeding the ABS system ..... don't mess with it unless you must. The shop that bleed mine introduced air into it and the first time I activated it on the race track was the last time I had brakes that day. I managed to get all the air out eventually. It took lots of bleeding and braking on slick surfaces, bleeding, braking on slick surfaces again, etc. BTW, the best surface I found for a though ABS cycling was grass.
Les
Les
Re: Brake bleed procedure
If you apply the brakes with the ignition OFF the pedal on my car goes to where I think it should be when applying the brakes.
Turn the ignition to ON and with the engine running the pedal drops too close to the floor with the minimum of effort on it.
Why is that?
The master cylinder piston has travelled very little with the ignition OFF and has to have travelled much farther with the ignition ON. Why is that?
I have a theory but I want other peoples ideas as well.
Turn the ignition to ON and with the engine running the pedal drops too close to the floor with the minimum of effort on it.
Why is that?
The master cylinder piston has travelled very little with the ignition OFF and has to have travelled much farther with the ignition ON. Why is that?
I have a theory but I want other peoples ideas as well.
Last edited by onehundred80; 07-07-2019 at 11:36 PM.
Re: Brake bleed procedure
Les, do you have SS brake hoses? I'm wondering if the OEM rubber hoses are as bad as the rest of the German plastics are.
Or maybe the caliper pistons get stuck or leak after sitting?
Dave, I was wondering the same thing so with the car running I pulled the vacuum hose from the booster and the pedal firmed up again. Probably because it takes 2000 psi to move the brake pistons.
Or maybe the caliper pistons get stuck or leak after sitting?
Dave, I was wondering the same thing so with the car running I pulled the vacuum hose from the booster and the pedal firmed up again. Probably because it takes 2000 psi to move the brake pistons.
Re: Brake bleed procedure
Yes, Stoptech BBK and stainless hoses. I can't find any leaks. The calipers have been refreshed twice over the years. My pedal has been low since new but once it hits resistance it will deform your brain.
The only problem I've had over the years ....... well, I go through rotors, pads, seals, etc. regularly .... is when I had my brakes bled by a performance shop. They "bled" the ABS module which resulted in a near death experience on track. Lesson learned. Recently I purchased a Motive power bleeder. I like it except for the wasted brake fluid.
Les
The only problem I've had over the years ....... well, I go through rotors, pads, seals, etc. regularly .... is when I had my brakes bled by a performance shop. They "bled" the ABS module which resulted in a near death experience on track. Lesson learned. Recently I purchased a Motive power bleeder. I like it except for the wasted brake fluid.
Les
Re: Brake bleed procedure
What about the master cylinder? Have you replaced that too? Somehow air is getting in but no sign of fluid leaks.
I'm thinking of raising the back of the car to bleed air getting trapped in the MC like this guy did. https://www.slkworld.com/slk-r170-ge...ake-pedal.html
Or just bench bleeding it.
I'm thinking of raising the back of the car to bleed air getting trapped in the MC like this guy did. https://www.slkworld.com/slk-r170-ge...ake-pedal.html
Or just bench bleeding it.
Last edited by ATX SRT-6; 07-10-2019 at 03:19 PM.
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