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MicKPM
ClioSport Trader
Clio16v/Zoe Z.E.50
How do you know you have no rear brake operation? More info required please... fluid levels, system integrity. You say the rear callipers are not siezed but how do you know this?
Generally if there's no rear brakes at all the problem is the callipers themselves as the rear bias is controlled by the ABS pump and even in a failure state it will allow for mechanical braking to occur when the pedal is pressed and the master cylinder actuated. The overall Left & Right/Front & Rear distribution is also split 50/50 by the mater cylinder (Depending on type fitted of course) but generally, as an example:
NSF/OSR will be on one circuit and NSR/OSF will be on the other so that if one circuit fails the car will still have some kind of balance under mechanical braking.
Generally if there's no rear brakes at all the problem is the callipers themselves as the rear bias is controlled by the ABS pump and even in a failure state it will allow for mechanical braking to occur when the pedal is pressed and the master cylinder actuated. The overall Left & Right/Front & Rear distribution is also split 50/50 by the mater cylinder (Depending on type fitted of course) but generally, as an example:
NSF/OSR will be on one circuit and NSR/OSF will be on the other so that if one circuit fails the car will still have some kind of balance under mechanical braking.
Ph1 172
I have jacked the rear of the car off the floor pressed the pedal with engine running and i can turn the wheels round by hand whilst a mate has his foot on the brake pedal! calipers aren't seized because they wind in! so you think it may be the abs pump?? i think its really weird because the front brakes work but the back doesnt!! your help is much appreciated as i am not very mechanical minded!!
172,scenic, trafic
correct me if im wrong but they wont work if off ground as the bias valve isnt under load
No bias valve. All done electrically in the abs pump.
172,scenic, trafic
thnx.lol
172 cup- suzu rf600r
unless its a cup in which case its valve controlled
pughy is it a cup? any warning lights on?
Ph1 172
No its not the cup full fat!! I have undone the bleed nipple and slowly pressed brake pedal and fluid has come out, then i topped fluid back up! i was thinking it was that the pistons were seized but when i took pads out of caliper and slightly pressed the brake pedal the piston did come out so i have no idea!! Garage job perhaps!
ITB'd MK1
calipers work on more than just the piston movement. Are the sliders moving freely? does the handbrake work?
In which case it isn't used and still shouldn't effect rear brake bias.
Ph1 172
Ye the handbrake still works fine!!
172 cup- suzu rf600r
unless the spring had broken and its seized in the wrong position? ach whatever anyway, this isnt helpful and im not that sure that il argue about it lol
Clios have hardly any brake pressure at the back, along with most light hatchbacks. The ratio of front to rear brakes as standard is aound 90%/10%. If it stops ok in a straight line when you are on the road, there is nothing wrong.
Its in a fixed position and not attached to the beam, the rear braking bias is set and doesn't alter with the position of the beam as it would conventionally. Hence all the inital mot fails on low rear braking effort and the vosa newsletter about it.
I disagree completely, it should be exactly the same as your mates. The braking split is low to the rear but its more like 70/30 off the top of my head and it should be more than capable of stopping you turning it by hand! That'll not be doing any braking on the road, do an hard emergency stop somewhere wide and spinnable and see what happens.
172DD Cup
this is the cheapest place i could fine. they also sell through their online shop for a couple of quid more than ebay.
http://cgi.ebay.co.uk/Brake-Caliper...CarParts_SM&hash=item3a60a92a92#ht_4319wt_905
£60 delivered but you get £25 back when you send them your busted unit. not bad for £35 a side, that's only £10 more than a rebuild kit.
http://cgi.ebay.co.uk/Brake-Caliper...CarParts_SM&hash=item3a60a92a92#ht_4319wt_905
£60 delivered but you get £25 back when you send them your busted unit. not bad for £35 a side, that's only £10 more than a rebuild kit.
