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Brakes Feeling Weired- Bm57 With R32 Gtr Booster & R33 Calipers

robbo_rb180
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robbo_rb180 Grand Master

robbo_rb180

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Posted (edited)

i have done a brake conversion on my sil80 and after bleeding them up the pedal feel is still not right. it takes half a pump to bring the brakes on and after that they work but still don't feel right.

the system is a bitsa and i was thinking it may be part of the problem.

this is what i have:

r32 gtr brake booster

holfords bm57 non-abs

front:r32 gtr- dba4000 with qfm MX pads, rear: r33 gtst- rda slotted & dimple with ebc red pads.

HEL braided lines

reinforced brake bracket

i think it may be the pad combination but when i remove the vac line to the booster they are alot better so maybe the booster is too big?

so far i have done this a few times - bled with a vac bleeder and then the 2 person way and started from rear pas, rear driver, front pas & front driver and also bled the master cylinder.

Edited by robbo_rb180
89CAL Grand Master

89CAL

Posted
Posted

Rob, I had a problem on my VL where I think the one way valve for the brake booster was missing or damaged and the brake pedal was soft all the way till full pressure but the brakes worked perfectly fine.

Bit different being NA vs Turbo but if its all been bled 100% and your setup is matched to each other then it could be somewhere worth looking.

Just a suggestion

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

I don't think its the combination of parts - I have a BM57 M/c (although I have ABS) R32GTR rear brakes and D2s at the front with a M/C stopper braided brake lines and Motul brake fluid and pedal is good first time. I think you need to look for a fault as suggested above.

robbo_rb180 Grand Master

robbo_rb180

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checked the one way valve and it works and is installed properly, going to go over everything angain, gravity bleed and then vacuum bleed them over the weekend and see how they come up.

VeildAttibdip Newbie

VeildAttibdip

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