More Front brake problems

Installed new pistons, seals and HH EBC pads today, along with new Dot 4 oil, the back set went on perfectly and we have good contact, however the front are not so happy.

The first problem we see is that when the pads make contact along the disc they are actually bending the disc back towards the wheel, on both sides, the second problem is we still have no pressure in the system it seems, the pistons when pushed out do retract back in slightly, we've been tapping the braided cables , the caliper, the master cylinder and flicking the lever for air bubbles and we havent been able to get any more air out, only fluid now it seems.

The only point i think is usefull is that there was new wheel bearings installed on the front ..not sure of that could be causing the disc's being pushed in.


Halp ... it's sunny !!!

The nightmare of DIY.

The front calipers should slid when you apply them, bring the rear pad into play. Sounds like the mechanism for that is not working. You did grease the two big sliding pins I presume.

Does the brake lever come back to the bar then?

Originally Posted by petevtwin650

The front calipers should slid when you apply them, bring the rear pad into play. Sounds like the mechanism for that is not working. You did grease the two big sliding pins I presume.

+ 1, first thing to look at!

Well folks, everything was super greased, however, it seems wemoto sent me one set of non sv seals, as one of the seals has a slight curve on it, so thanks wemoto, we found this out when the fluid came lashing out of it.

But !! the problem it seems was not solved just there, the front right disc is warped, baddly, thats making it impossibly to build up pressure in the system correctly.

So i need either a new or 2nd hand front disc, any body want to help me there, but i could do with it being shipped 1st thing monday morning in the super fast post

dave.

[yorkie_chris]

Spin the front wheel with the calipers off, if you can see "wibble" in the disc then it's warped.

Usually if it's warped you get good lever pressure but loads of excess travel when moving.

I reckon you've got corrosion in the hole for the rubber slider which is stopping the slider from moving freely.

Ahh you can see the curve on the disc, chris, it's like looking at ) ...the front right hand caliper was seized baddly over the past few weeks, so i assume thats when the damage was done, it's no big panic, i needed new discs any way, but it's just another delay now

Quick follow up Q are disc's inter changeable on either sides, can i put a left disc on the right hand side ?

As far as I know yes, both sides have the same part number but do not come as a pair when ordered!

Not only will it help the bleeding process, but it will also mean you don;t need a 'straight' disc to bleed the brakes, use a G-Clamp on the calliper. Basically put the old pad that went on the piston side back in, then wind the g-clamp in such that the pistons are fully 'home'. The G-Clamp will provide the resistance you are after and probably have expelled a little air in the process ... plus as there is less fluid in the system, its quicker/easier to bleed

Originally Posted by Blue_SV650S

Not only will it help the bleeding process, but it will also mean you don;t need a 'straight' disc to bleed the brakes, use a G-Clamp on the calliper. Basically put the old pad that went on the piston side back in, then wind the g-clamp in such that the pistons are fully 'home'. The G-Clamp will provide the resistance you are after and probably have expelled a little air in the process ... plus as there is less fluid in the system, its quicker/easier to bleed

Good tip there Blue, gonna see if i can get a new set of disc's here locally, wavey's would be nice, might as well splash the cash.