My freshly refurbed calipers are binding on 30kgs, I've bled the brakes twice over now so I know for sure it's not due to air or a twisted hose etc.

The chap at my local MOT station said that he cannot pass the car while the brake are like they are. Do they just need bedding in? The disks and pads are the same items that were removed from the car before the calipers were refurbed.

Any ideas? Obviously I want them to be safe as I have my little lad in the car with me when I have him over.

Big-Dan.

 

Plenty grease on the carrier slides?

 

Yes mate, I spread it all over like I was making a sandwich with the stuff.

Big-Dan.

 

That's the only thing I could think of, that's what caused mine to bind on, which warped the discs!

 

I see. How little copper grease did you have on there? I'm thinking about just lathering it on, might even grease the disks, they won't bind on then

Big-Dan.

 

None at all! I bought a big brake kit second hand and the carrier slides were bone dry. When I fitted the kit it turned out the discs were warped also, caused by the brakes binding. Put new discs on and it's great now

 

I'm pretty sure my disks aren't warped though, can't understand why they are binding on, doing my fucking swede in to be honest now.

Big-Dan.

 

did you clamp the pipes when you did your refurb might have crushed the pipes or a seal in the caliper is sticking/fitted wrong
how easy is it to spin with the wheel off

 

Anybody else have any suggestions?

Don't fancy handing any more money over to the spanner man unless I really have to.

Big-Dan.

 

if calipers and discs are known to be good ,then the above post of possible pipe failure is a good one,I take it before the change everything was fine

 

Have the discs been physically checked?

I could only suggest that there might be hub damage, or that the refurbished caliper is faulty in some way.

 

I had the callers professionallly rebuilt by bigg red in worcester, brakes worked fine before bar the drivers side caliber seizing up if left sitting for a while. Pads, disks and pipes are all the same items that were in use before calipers were sent for refurb, when the car is jacked up neither of the front wheels spin freely, they are both very resistant.

 

i say rubber flex hoses crushed not letting the brake fluid back to the master cylinder intern holding your brakes on

ohh how free are your pads in the carier the have to move freely

 

remove the vacuum pipe from the servo and try them them out on the road

just be prepared to not be going fast and needing a BIG push on the brake pedal to stop

but it should eliminate a broken one way valve

you can then start checking for pipes and stuff and getting dirty that way

 

30kg is not a good enough reason to fail on the brake roller tester

how easily does the wheel turn by hand?

is it a front wheel, and have you got any kind of limited slip diff fitted? if so, it shouldnt even be near the roller brake tester

 

I thought any binding was a fail ?
tabetha

 

I did one at work the other week, and me dads a couple of weekends ago, where the brake hose had collapsed on the inside, and holding pressure in the calliper. Looked fine, didn't flex/bulge/distort and the pedal felt fine, obviuosly 'coz the fluid could force its way through under hydraulic pressure, just couldn't return.

 

theres an advise for slighly binding, and from my experience 30kg isnt binding enough for a fail. if the wheel cant be turned when in the air, then id be concerned about it. but if theres a LSD fitted then the MOT states that the vehicle should NOT be tested in the brake rollers anyway


as mentioned above, the flexi hoses can deteriorate internally and act as a one way valve

 

The wheels can't be turned freely when in the air, you really have to force them, both sides.

One thing I forgot to mention is that when bleeding the rear calipers hardly any fluid at all came out at all, could that be a sign of a collapsed hose?

Is there anyway I can diagnose whether or not a hose is at fault other than taking the current ones off?

I'll try and find out abit more info on the gearbox, pretty sure that it's a CTS stage 1 box with no diff but will find out to be sure.

Big-Dan.

 

Okay, a friend of mine has just asked me if the brake pads are the right way round.

He's just told me that there should be a left pad and a right pad for each disc and that the fibres of the pad are made so that they won't work in the opposite sides.

Is he winding me up or is this a genuine shout?

Big-Dan.

 

It does, CTS Stage 1 rebuild with standard LSD

 

Cheers mate

Big-Dan.

 

Just slacken each bleed nipple on each caliper in turn and se if they free-off. If they do its a pressure problem and not your calipers.

To check if its brake hoses, roller brake test them and see if they decrease at a good rate and arnt lazy!!!

Quite rare both hoses go at the same time though!

 

IF it has a lsd fitted IT SHOULDNT BE ROLLER BRAKE TESTED

 

You are correct, but I dont know if its has, this was just a general assumption as I thought it had all ready been RBT, also good advise for others if they dont have an LSD!!!

Why cant you test for hoses anyway on a RBT, surely as long as you set both rollers turning and DONT lock the wheels, it shouldnt be a problem!!

Surely, using only say 100kg of force, wont lock the brakes up and will be enough to detect a restricted hose

Just an idea!!!