Author Topic: Brake Issue  (Read 150 times)

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Offline Preisig

  • Posts: 32
Brake Issue
« on: September 28, 2017, 10:43:28 pm »
Hi All,

I'm hoping someone has the answer here. I've recently finished rebuilding my 85 UR Coupe after a few years of rebuilding. I have one issue I could seem to sort. My brakes.

When I press on the brake pedal the brake goes down to the floor, it does brake however its right at the bottom of the pedal. I've bleed the system several times and there is no air in the system. If I pump the pedal it still doesn't come up, if it was air it would pump up.

My suspicion is that it is the hydraulic pressure accumulator has failed, has anyone one got any ideas what else it might be or a way to fix it

Thanks

John

85 URQ
GT40 Mk1
Lola T140 F5000

Offline McDoof

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Re: Brake Issue
« Reply #1 on: September 29, 2017, 09:10:19 am »
This might be a stupid question, but did you also bench bleed the master cylinder?
NZ New MK5 GTI - Tuned by HSP Tuning

Offline GlenT

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Re: Brake Issue
« Reply #2 on: October 23, 2017, 03:55:03 pm »
Hi All,

I'm hoping someone has the answer here. I've recently finished rebuilding my 85 UR Coupe after a few years of rebuilding. I have one issue I could seem to sort. My brakes.

When I press on the brake pedal the brake goes down to the floor, it does brake however its right at the bottom of the pedal. I've bleed the system several times and there is no air in the system. If I pump the pedal it still doesn't come up, if it was air it would pump up.

My suspicion is that it is the hydraulic pressure accumulator has failed, has anyone one got any ideas what else it might be or a way to fix it

Thanks

John
Hi John,

Have you established if it is actually the accumulator?
Start the engine and let it run for a minute to allow sufficient hydraulic pressure to build.
Then, turn the engine off and count the number of presses you get before the pedal goes hard.
If it's less than 10 then the accumulator is on it's way out. 11-30 is considered normal.

Regards,   Glen