jameswwt

Hi Guys,
currently my brake seems only biting on the rear part and the front doesnt seem biting at all or much...
The rust on the front rotors still present after even 2 days of driving.
This happen after ive changed my rotors (Front & Rear) and brake pads for front only.

Today ive changed the brake fluid dot 4.0 bosch and hope it will be fine after few days of running the new front brake pads...

Say,if after few days the problem still the same, then what area should i need to focus on (Brake pump, Brembo service kit, Etc)???

Thanks

spdngdragon

iTrader: (3)

check to make sure that the pads are able to move and something didn't get dropped into the calipers that will prevent their movement. Check to make sure that the pistons have not seized up. It is extremely dangerous to drive without your front brakes. They do most of your braking! Any surface rust on your brakes should be gone within the first couple of times that you apply your brakes!

phemes

iTrader: (3)

Did you bleed each caliper properly ??

05blue8

iTrader: (28)

Also when you opened each bleeder valve to bleed them did the fluid easily get pumped out in spurts or did it just slowly drip out? I've seen cars where the bleeder valve was completely rusted over on the inner part of it so it wouldn't bleed and had the piston in the caliper seized

jameswwt

Hi Guys,
yes, my mech have bleed the 4 valve and yes, everything is normal while bleeding...
No entrap air or slow dripping.

Will it be the master pump problem? Ive checked the front 2 caliper pistons and when we press on the brake the pistons will come out each at a time...This is mainly to check whether is it a jam pump.

Everything just seems to goes a bit hairwire after my complete rebuilt.
Will it caused by faulty sensors or faulty AYC?

What should i do now?

phemes

iTrader: (3)

Try braking HARD from 70ish (when safe to do) and see if the fronts work then.

jameswwt

Hi Phemes,
yes ive tried braking hard during 100ish but confirmed the front brake is not biting...
The curious part is,when we remove the front pads earlier and checked on the pistons it did work when we pedal the brake.
But the pistons just come out one at a time...

Will it be a brake pump problem and can i try putting in a new service kit for the front brembo's???

Please advise

jameswwt

Anyone kind to share???

Thanks

phemes

iTrader: (3)

It must be air in the system I think........

jameswwt

Any other ideas?

Thanks

Solo II Evo

iTrader: (29)

To rule out the possibility of it being an air-in-fluid problem, how does the brake pedal feel when driving? Is it soft? Firm? is the pedal inconsistent in pressure?

If its firm, and the pedal provides constant 'feel' then it's time to look into those calipers. A Master Cylinder leak can easily be spotted by inspecting the cylinder itself, and the hard line connections, etc. Any internal leak in the cylinder would be accompanied by a squishy pedal, so if again your pedal is firm, I would start checking out those calipers.


Another thought too, is your brake line where it bolts to the strut kinked at all? Inspect the lines themselves throughly in the wheel wells.

jameswwt

Thanks Solo

M.P.G.

iTrader: (1)

Are you sure the rotors are the correct size ?

phemes

iTrader: (3)

When the pressure in the system rises because you put you foot on the brake, a bad master cylinder will allow leakage past the seal and limit the pressure so the pistons won't apply much force. This will not show up when testing piston movement with the caliper off the rotor as there is no pressure to cause the leak back. In short, get a new master cylinder.

jameswwt

Thanks alot Phemes