All Things Mk5 > Performance Modifications

Soft Brake Pedal When Stationary

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th3_f15t:
Evening all. I have an issue with my Golf R's brakes. I recently fitted Porsche Cayenne 6 piston Brembo calipers and rear stainless steel lines which have massively improved the braking. However, when stationary, the pedal goes soft and I can depress is almost to the floor (same in neutral). Car is DSG for info.

I suspect it's the master cylinder not being able to maintain enough pressure in the system when still but I could be wrong. When I bled the system, I did the rears first, then the fronts, then cycled the ABS pump a few times but hasn't seemed to cure the issue. Made sure that clean, air free fluid was coming out the calipers when bleeding. Any other suggestions to try?

r5gtt:
I'd say you've got a weak master and it needs upgrading from the forum reads re brake upgrades and you're running 6 pots so that maybe the reason.

Rear left rear right front left then front right high performance fluid should be used to maintain pressure at a high boiling point.  hope I'm not talking jibberish  :signLOL:

doylebros:
My first thought is

What equipment was used for the bleed operation, pressurised or manual equipment.

What start and finish point.

vRSAlex:
Is it fine when driving?

Jump into another R with stock brakes and you will find that they all do it.

omeydz:
Did the reservoir go empty at all?

When I was replacing faulty ABS MK60 to the EC1 version that happened to me and kept sinking to the floor with my pressure bleeder.

Apparently repeated pressing of the pedal this low can affect the master cylinder seals somewhere I read.

Got a garage to finish the bleed with their kit and the pedal takes a little more travel to bite the brakes compared to standard (OEM brakes). Almost more progressive than biting high up on the brake pedal travel cycle. Passed MOT etc fine and no leaks.

So think the master cylinder would probably need changing to make it perfect if what I described above has happened.

Hope that helps  :happy2:

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