Hi all

I have a S1 with cosy front and rear conversion. I have just had the mastercylinder changed as it was starting to leak, but now the brake pedal goes 3/4 of the way down before it starts to work.

The pedal did have travell before but not this much. The servo is working and I have pressure blead the system about four times so it can't be air in the system.

The brakes work but would like more pedal as it don't feel right and I don't want to miss judge braking and go up the back of someone.

Anyone know what's going on or if I can alter the amount of travel.

Cheers all

Matt

 

hmm possible the vacuum could be playing up to be honest bud on something as vital as that it could pay to have it tested as iam sure it wouldnt cost a great deal one thing did you know the type of fluid that was in before cus if it was dot 5 and you have put say dot 4 in it will be a little spongier than with the dot 5 in

 

HI,

seems like faulty master cylinder was it new, or second hand,you can adjust the pedal travel but go gently by taking the master cylinder away from the servo
unit leave brake pipes on u should have enouth room, you will see the pushrod
coming out of the servo unit with a dome end hold the 1 part and adjust a few
turns at a time, and try,mark it before u start so you can go back if you like,
if u over do it the brakes will bind on , i am assuming you are using s1 master
cylinder, the servo, and air in system you have already covered so providing
theres's plenty of meat on the pads front and rear, its master cylinder,
plus are the brake discs alround in good condition.
Dave,

 

what angle are the rear calipers mounted at? The cossie rear caliper is designed to be mounted horizontally on top of the disc - on a S1/S2 conversion they are mounted off the top, at an angle. This means the bleed nipple drilling doesn't end up at the top of the piston cylinder, allowing air to accumulate which can't then escape.
Try bleeding the back brakes with the calipers turned horizontal (remove one of the fixing bolts and twist the caliper so it's horizontal)

 

If you ain't using braided hoses, then it might be worth clamping off all your hoses with vice grips. If your pedal remains sh1te then your fault is in the master cylinder or rod adjustment. If your pedal is now solid, then you have air in or around one of your callipers.

What you will need to do now is get a mate to sit in tour car with his foot hard on the brake.
Take off each of the vice grips in turn. Ask your mate which vice grip allowed the most travel and there lies your problem. Great in theory but not always easy or clear cut in practice.

HTH

 

Well from my experience, when i put cossie setup all round i had the same problem. Problem was the diameter of the Original Master Cylinder was not big enough. So i had to Fit one from a MK5 Escort, this transformed the brake and pedal feel.

 

Cheers all for the advice, me and the mechanic did wonder if the problem lay in the size of the master cylinder, not being made to work 4 calipers, it will be going back in for another check now that I have ran it for a bit.

Cheers