Having done the 6n2 brake rear conversion  i notice the rear brake discs are burning hot after a ten minute drive.

The front are warm/cool enough to touch.

 

Is this normal?

Bleed again, check pad alignment, check hand break 

thanks for reply kiran

 

I can push the car when handbrake down so I assume handbrake allright.

On the rear they were black diamond disc so when the pads bedded the black colour is removed from disc so i know the brake pads are in the proper position when looking at them. Obviously hard to check this on the backside.

 

Bleeding? If there was air issue , would it not mean bad braking , hence being cooler rather than hot. talking about the rear of course.

 

To me it looks like the fronts are not braking properly. Way to cold. maybe there is air issue there, bugger, those are the ones where bleed nipple are snapped.

Might need to put it on brake rollers at a garage.

If there was an air bubble I think the pedal would be spongy.

 

Is there a balance valve between front and rear?

Especially load sensitive item for heavy weight in back on lowered car can put too much force on rears.

 

On my mk2 it is near fuel tank on opposite side to filler neck.

Lower the rear is the more easily I can lock the rear wheels first (not good - car could spin in emergency stop), so I have 60 or 65mm front and 40mm rear shocks and springs.

(I have drums at back not discs conversion)

 

Are fronts and rears both vented discs?

 

Edited 15 July, 20197 yr by dvderlm

With drum brakes, there is always a clearance between the lining and the drum.

On disc systems, the pads run in (very light) contact with the disc, so will generate some heat at all times.

 

The fact that the front brakes are only cool/warm makes me wonder if they are working as they should.

With the front pads removed, it should be possible to lever the slide carrier in its mountings. If it is seized, only one pad will work and it will tend to flex the disc into contact with the seized pad, eventually breaking off the disc from its hub.

 

A likely cause of the rear brakes being too hot, is that the hand brake cable is too tight - try slackening it off a little, so that you have to pull it up an extra notch for it to be fully applied.

Also check that the cables are free to move in their guides.

I can't remember if your model has swivelling cable guides, but if it does, obviously these need to be able to actually swivel.

 

Regards

When you drive heat is generated in the caliper which causes the brake fluid to expand. Normally this expansion is accepted into the master, but if it is over filled there is nowhere for it to go so it pushes the calipers piston out which creates excessive friction between the brake pads and rotors. so this is the reason when brakes get hot, so its not a big deal.

Edited 8 September, 20197 yr by Dean
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jack the rear up....do both wheels spin freely when cold , and again when youve driven for 10 mins 

 

rears would always be cooler than the fronts ...fronts do all the work , something is wrong