C 202 Brake probs after replacing.

[Algygale]

Hi..

Just changed me Front/rear pads & rear disks on c200k..job went fine and pumped pistons back out after doing each wheel as not to overflow mastercylinder.

But now my pedal slowly sinks to the floor..but can be pumped up..brakes are pants but need bedding in..so..have i blown the seals in the M-cylinder or does it have to be reset by MB?

f i have blown them..is it poss to buy seal kits? and from who?

Thanks..

Alan.

 

[television]

Thats unusual Alan, cant think what has happened, you can try bleeding but has the master cylinder gone down ???

If it was leaking you would see it as the fluid would be coming out

 

[Algygale]

No..its gone up if anything, i noticed its over the max level now.

No leaks anywhere but will have another look in the morning.

I did notice the front was dipping down a bit whilst braking so think its the rears not working but until the residue of the anti corrosion stuff on the new discs has burnt off i wont be sure..yes i did clean them.

So theres no reset for the ABS/Trac control im missing then?

****** thing..knew it was going too well never had this happen before on any car.

 

[television]

If you can pump the pedal up, then its air, if it slowly sinks with light pressure the the master cylinder

No re set

 

[panason1c]

If you only changed the pads then there's no reason for air to have entered the system.

Pumping the pistons back out by allowing the brake pedal to travel ALL the way down has probably damaged the master cylinder seals, it is always best to pump the brake pedal in very short strokes so as not to allow the m/c seals to extend beyond their normal travel as a ridge will build up over time at the point the seals extend to, the seals will have gone 'over' the ridge causing damage to the seal edge.

 

[television]

If you only changed the pads then there's no reason for air to have entered the system.

Pumping the pistons back out by allowing the brake pedal to travel ALL the way down has probably damaged the master cylinder seals, it is always best to pump the brake pedal in very short strokes so as not to allow the m/c seals to extend beyond their normal travel as a ridge will build up over time at the point the seals extend to, the seals will have gone 'over' the ridge causing damage to the seal edge.

A very good post above, so easily done, that probably the way that I damaged my V70R master cylinder as that went shortly after changing the pads

 

[Algygale]

If you only changed the pads then there's no reason for air to have entered the system.

Pumping the pistons back out by allowing the brake pedal to travel ALL the way down has probably damaged the master cylinder seals, it is always best to pump the brake pedal in very short strokes so as not to allow the m/c seals to extend beyond their normal travel as a ridge will build up over time at the point the seals extend to, the seals will have gone 'over' the ridge causing damage to the seal edge.

Hi..i Did around 400 miles in it since the fault & it seems ok again.
Still not sure if the rear brakes are working but the new rust on new disks seems to disappear so guess they must be.

Gonna take it to an MOT station & see if they will put it on brake tester to make sure.

Thanks..

Will let you know the outcome.

 

[FIBAMAN]

No..its gone up if anything, i noticed its over the max level now.

No leaks anywhere but will have another look in the morning.

I did notice the front was dipping down a bit whilst braking so think its the rears not working but until the residue of the anti corrosion stuff on the new discs has burnt off i wont be sure..yes i did clean them.

So theres no reset for the ABS/Trac control im missing then?

****** thing..knew it was going too well never had this happen before on any car.

I am not sure what you are referring to when you say the anti corrosion suff has burnt off, you should have removed all traces of this with solvent or similar before assembling

 

[Ron Palfrey]

Bet that did the new pads a lot of good!

 

[carabind]

Bet that did the new pads a lot of good!

I wouldn't like to be in front of that car on the motoway if he had to do an emergency stop! Would suggest an immediate pad change, if you haven't cleaned the discs before fitting them

 

[Algygale]

I wouldn't like to be in front of that car on the motoway if he had to do an emergency stop! Would suggest an immediate pad change, if you haven't cleaned the discs before fitting them

Er..if you read the previous posts you would have read that i did clean it off but its possible that a small amount would still be present.

 

[television]

Er..if you read the previous posts you would have read that i did clean it off but its possible that a small amount would still be present.

This has nothing to do with the problem of the pedal sinking