RUBY123

iTrader: (2)

hello fitted a rear disc conversion consisting of cosworth 4x4 discs and callipers and they don't seem to be releasing. on the jack you can spin the wheel and press the brakes and then spin it again fine but drive round the block and they get very hot. any one else experienced this problem

studabear

Are the pads free in the carrier? is the handbrake when released allowing caliper levers to return to there stops?

RUBY123

iTrader: (2)

yes all fine they all move fine all coper greased up hand brake levers move fine but obviously binding as getting hot

RUBY123

iTrader: (2)

Could the master cylinder cause this

james kiely

iTrader: (5)

heres my twopence worth

i bought a convesion but i have to pick it up and fit it yet ,but from what i seen and was told by the chap it has a mk5/mk6 handbrake cable as the calipers work the opposite way to the way the oldsystem worked so could it be when the handbrake is off the brakes are actually on if you know what i mean

RUBY123

iTrader: (2)

Yes you do need a rs2000 hand brake cable

Antti O

My rear disc brakes was letting on because of rear axle compensators. Bypass those and brakes will release completely. Altough brake balance is ruined.

I suggest you change drum brakes back with original compensator setup, rear disc conversion is shit i say.

RUBY123

iTrader: (2)

Its a strange one when I unbolt the rear wheels the brakes don't stick on which is strange as the caliper slider bracket is central to the disc and the caliper centres uts self. I'm going to wind the caliper in later bolt the wheel on then press the pedal so it meets the disc how it should can't see it making any diffrence though lol

martysmartie

iTrader: (1)

There binding, where did you source the calipers? They do have a common problem for seizing, so if you got second hand etc. Also a collapsed hose can cause this.

The cable is fine by the sounds of it, as the problem is only apparent once you start driving the car and you say the levers are releasing.

Martin

RUBY123

iTrader: (2)

Irs strange the calipers are working fine ther are not seized hand brake lever is free and working perfectly and when the wheels are off they work fine and are releasing fine its when the wheels are put on the problem starts like the slider brackets are seized not letting the calipper ceter its self but the slider brackets are also freely moving lol

mentalasanything

It sounds like the spacers between the caliper and the mounting plate arent the correct size. It binds with the wheel on because the disk is pushed against the rear pad.

Take the spacers out and measure them, IIRC they need to be 9mm.

To test, add washers to the spacers to increase the size untill they work again, then get some new spacers made to the correct thickness.

My rear disk conversion works absolutely fine without compensators on an XR3i master cylinder. No bias valve either and it passed an MOT 2 weeks ago with no wheel drag and adequate force.

Lee

RUBY123

iTrader: (2)

I'll try in a bit but the caliper slider is central to the disc when all bolted up