GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Craigwilson on 20 May 2013, 23:28
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Okay I have a 91 8v GTI, a few years ago I fitted the girling 60 callipers with the 280mm discs a new 23mm master cylinder and all flexi hoses are good ridge braided and I just fitted and new brake load sensing valve. But since i fitted the big brakes my brake pedal has had a huge amount of travel It has about 3 inches of slack before there's any pressure but when you take up the slack it is giving gentle brakes and when you push on the pressure after the slack the brakes are amazing. Does anyone know how to sort out the long pedal travel its begging to get annoying, thanks.
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You need to fit a larger master cylinder. 22mm from a 16v.
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I have a 23mm master cylinder fitted
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When did you last change the fluid?
Are you also sure the MC is not leaking & needs replacing??
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Bled the whole system today, all new brake pipes, I'm very sure the MC isn't leaking because the brake have been like that since the MC was new those brakes have just always been like that but the MOT tester says it has to be fixed.
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Did you bleed enough to change the whole system??
If yes, then the MC need replacing as it bleeding internally.
It wont leak externally as such but the rubber seals inside are letting air into the system...
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Yeah I'm sure I bled it right through, would the seals leaking internally still give me the amazing brakes tho because once you push it they really are
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Yes at times and at others NOTHING.... Same thing happened with my lads 1.6 driver...
I drove it... brakes perfect... he drove it back home brakes failed...
all down to the MC so we fitted a new one.. all fine all the time..
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Well I'm not at the stage of no brakes as long as you take up the travel and then press into the pressure the brakes are good every time and its been like that over 2 years.
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I'm no mechanic..
BUT I'll put £10.00 bet on that the issue is with the MC....
TBH Stuff like brakes are not worth the chance of killing someone, so get them checked out by someone who knows MK2's and what they are doing....
Just not worth the risk..
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Well you wouldn't by any chance have a 25mm master cylinder in your eBay store for less than a million pounds would you, new ones cost a fortune
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Sorry I don't & I wouldn't sell used ones unless I knew 100% they were safe...
Some things aren't worth selling if someone's life depends on it....
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Fair shout
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Sorry to sound like an old fuddy duddy - but get them checked out by an expert...
You dont want to have the stigma of being a killer for the sake of a few quid....
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No worries, I'm thinking of buying a new 25.4mm master cylinder and see how that goes
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what power is your mk2 putting out?
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I'm not sure the guys that built my engine reckon about 125bhp but I really don't know all I know is its faster than my dads but not as fast as a mates mate he used to run 140 from an 8v
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a std 16v master cylinder will more than suffice on 280mm brake setup, and will be a lot cheaper and easier to find than a 25mm, so just try one of those
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a std 16v master cylinder will more than suffice on 280mm brake setup, and will be a lot cheaper and easier to find than a 25mm, so just try one of those
I did think that... It's not as if it's got 300 BPH that you are trying to stop...
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i think part of the problem is that people compare mk2 pedal feel with todays more modern over-assisted brakes and think that there is a prob with their mk2!
i found that driving something like a new audi after a drive in a mk2, the first time you put your foot on the brakes you near put yourself through the front window
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I all ready have a 23mm master cylinder on it which is bigger than the 16v MC, And trust me it's not that I'm comparing it when I depress my pedal it's only an inch off the floor
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And also my front callipers are twin pots and I was told minimum size of MC that will push them is 23mm
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Ahh my mistake you have the S2 calipers, yeah bigger master cylinder needed s2 had the 25mm master cylinder
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Bigger master cylinder is not needed, I have the same set up with 23.3 mm Audi master cylinder and the pedal is firm and brakes are spot on.
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If you have more volume in your callipers a standard MC will have more pedal travel
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If you have more volume in your callipers a standard MC will have more pedal travel
Which is why he's using a larger master cylinder..
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So could my MC be faulty ? Because I have a spare new one I could swap it with.
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Could be. Did you clamp the compensator when bleeding? Have you tried removing the calipers and hanging them from the struts to get them up higher when bleeding? I had a bit of trouble getting the last bit of air out of my twin pots last time I bled them.
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Yeah the compensator was opened, I don't think there's air in the system because the brakes are good and the pedals not spongy it justs moves a lot, but no harm in trying
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If you have more volume in your callipers a standard MC will have more pedal travel
Which is why he's using a larger master cylinder..
So the 1.0 mm increase over the 16v mc in piston area is equal to the volume you need to displace for the bigger twin pot callipers over the same stroke length?
Forgive me if this has been calculated and I have just not read the post properly
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It was calculated by Audi mate.
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The MC audi used on the twin pots was a 25.4mm, mine is 23mm
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It was calculated by Audi mate.
The MC audi used on the twin pots was a 25.4mm, mine is 23mm