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Help Needed - Bleeding Brakes After Big Brake Upgrade


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Afternoon all. Got some 355mm AP racing 6 pots on my P1 and the Subaru 290mm twin pot conversion for the rear. Replaced the master cylinder and tried everything from Easybleed to back bleeding. 3 pumps on the pedal and it's solid but come off and try again and nothing.

Been told to try bleeding the ABS unit which is being done just now but my mechanic and me are at the end of our wits with it. Anyone got any other ideas?

Cheers

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Afternoon all. Got some 355mm AP racing 6 pots on my P1 and the Subaru 290mm twin pot conversion for the rear. Replaced the master cylinder and tried everything from Easybleed to back bleeding. 3 pumps on the pedal and it's solid but come off and try again and nothing.

Been told to try bleeding the ABS unit which is being done just now but my mechanic and me are at the end of our wits with it. Anyone got any other ideas?

Cheers

ABS unit now bled, a tiny bit of air from one pipe but the others fine. It's holding a pedal after a few pumps so new master cylinder isn't leaking.

Aaaaaaaaaaarrrgh!

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sorry i havent got any other ideas bar a leak or needing a new nipple some where. there is a correct order for bleeding starting at the back but i just work on one corner at a time.

edit: new calipers or second hand? maybe someones had them apart and o ring between two halves is missing somewhere.

Edited by euan_r
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Cheers Euan

Brand new AP's on the front and recon twin pots on the back. New washers all round.

Just spent another hour with 3 mechanics on it and another litre of fluid. Tried ABS unit again, some device in front of the fluid resevoir all to no avail. Got it down to one pump to get a pedal, no creep indicating no air locks but come off and no pedal again. Totally at a loss

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How is it bled? Engine running or not?

Is the pedal fine all the time with the engine off?

Do you bleed with the bleed nipple open then close with the last press of the pedal?

Pump up the pedal and hold a hard pressure on it, then open the nipple to force the fluid through, close the nipple when pedal is at the floor. Do this a couple of times starting from furthest from reservoir to nearest.

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How is it bled? Engine running or not?

Is the pedal fine all the time with the engine off?

Do you bleed with the bleed nipple open then close with the last press of the pedal?

Pump up the pedal and hold a hard pressure on it, then open the nipple to force the fluid through, close the nipple when pedal is at the floor. Do this a couple of times starting from furthest from reservoir to nearest.

Thanks Alan.

The nipples are opened when theres pressure then closed when at the floor.

Found out theres a bleed sequence of pass front, drivers rear, drivers front then pass rear as the system is set up diagonally which is being tried by my mechanic right now. Fingers crossed!

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Thanks Alan.

The nipples are opened when theres pressure then closed when at the floor.

Found out theres a bleed sequence of pass front, drivers rear, drivers front then pass rear as the system is set up diagonally which is being tried by my mechanic right now. Fingers crossed!

i had issues bleeding my prodrive front upgrage bledd all the nipple (two on each caliper) spongy pedal, then went round each nipple again to find a tiny bit of air in each, rock solid pedal after that

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Might sound daft, but you did notice there's two bleed nipples on each caliper ?!

Yep Alan, bleeding the inside one first. Praying this diagonal bleeding sequence does the trick so I make Knockhill at the end of the month. Still got a geometry set up and was meant to get some paint done but that can wait!

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How do the brakes feel out on the road? :)

I'm in work mate and the cars in the garage, will report back once i've had a shot tonight, providing nothing else goes wrong!

Still to bed them in and some nice new coilovers to bed in too. Can't wait!

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I'm in work mate and the cars in the garage, will report back once i've had a shot tonight, providing nothing else goes wrong!

Still to bed them in and some nice new coilovers to bed in too. Can't wait!

All sorted, i'd inadvertently put the rears on the wrong side so the nipples were at the bottom, spent so much time worrying the fronts were on the right way missed what was staring me in the face!

The new set up is amazing. So sharp it's unbelievable. They'll get their proper test at Knockhill at the end of the month!

Cheers for all the input

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All sorted, i'd inadvertently put the rears on the wrong side so the nipples were at the bottom, spent so much time worrying the fronts were on the right way missed what was staring me in the face!

The new set up is amazing. So sharp it's unbelievable. They'll get their proper test at Knockhill at the end of the month!

Cheers for all the input

Well done! AlanG To the rescue again!

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