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#11 Re: Master cylinder mod to suit 4 wheel discs
1200rallycar Posted on: 2012/7/7 11:36
yeah it got the better of me today

first couple of times the rear passenger calliper was the only hot brake (walking around the car burning my finger tips off trying to figure out what was going on)

next couple of times it was both backs (and definitely not fronts)

today it was all four, i was cracking the nipples on the master to release the pressure (did it twice to get home, about 2km)

the front circuit had more pressure, but i was cracking it first so im not sure if that's why not much released from the back circuit when cracking it open second


[edit] using dot 4, lids on new master say to use dot 3 but i ignored that


#12 Re: Master cylinder mod to suit 4 wheel discs
wards Posted on: 2012/7/7 12:46
Check that the pedal is coming all the way back and that the push rod has play in the back of the master cyl piston , the piston must come all the way back to the circlip in order to expose the fill ports in the resivoir . It sounds like the push rod is too long and this could cause your hard to bleed and holding pressure issues


#13 Re: Master cylinder mod to suit 4 wheel discs
1200rallycar Posted on: 2012/7/7 12:53
good idea wards, will do

the new master has a small bolt that screws up in to the barrel, between where the brake lines screw in, any know what that is/does?


#14 Re: Master cylinder mod to suit 4 wheel discs
tommo73 Posted on: 2012/7/7 14:21
master needs spacing with the shims on the fire wall/changing rod length/adjust peddle stop
if you got pressure at master holding brakes on master is not releaving pressure
you will have huge problems bleading because not using fluid from resiviour
piston not back far enough fill port not open


#15 Re: Master cylinder mod to suit 4 wheel discs
supafatto Posted on: 2012/7/7 14:22
Holds the pistons in


#16 Re: Master cylinder mod to suit 4 wheel discs
tommo73 Posted on: 2012/7/7 14:25
small bolt holds half of master together, circlip other half


#17 Re: Master cylinder mod to suit 4 wheel discs
PIGDOG Posted on: 2012/7/7 14:26
ah yeah that too. would explain it. one of the main thins you should check when putting any master cylinder in
only ever had that problem with a clutch so didn't think of that


#18 Re: Master cylinder mod to suit 4 wheel discs
1200rallycar Posted on: 2012/7/9 12:06
so yeah... checked out the whole pedal operation

stupidest thing ever

the brake light switch was wound in so far it was holding the pedal on just enough...

i think with the new master the distance was slightly different and it amplified the problem


#19 Re: Master cylinder mod to suit 4 wheel discs
1200rallycar Posted on: 2012/7/10 5:47
FECK!!!

went to get sound test today, brakes locked up again, i dunno what the feck is going on, i can't believe it, i'm tearing my hair out now


#20 Re: Master cylinder mod to suit 4 wheel discs
Posted on: 2012/7/10 6:03
Maybe needs further shim for clearance/free play



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