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[Miggy24]

Hi all just fitted some new front brake pads.i took the brake fliuld cap off so when i pushed the piston/s in it wouldnt make to much pressure.Anyway after fitting them i started the car up and pumped the brake pedal it got hard but it went down to the floor.I then took out some brake fluild and the brakes got alot harder and better but still went to the floor.Do you think iv got some air in ther brakes

[tunnie]

Hi all just fitted some new front brake pads.i took the brake fliuld cap off so when i pushed the piston/s in it wouldnt make to much pressure.Anyway after fitting them i started the car up and pumped the brake pedal it got hard but it went down to the floor.I then took out some brake fluild and the brakes got alot harder and better but still went to the floor.Do you think iv got some air in ther brakes

How much fluid was in the tank?

You did not need to open it really, just lift the caliper up, and push it in with a large G-Clamp or something, then pop the new pads in.

[Miggy24]

well it over filled thats why i took some fluilded out but like i said it did made the brakes alot better but pedal still goes to the floor so i think theres air in the brakes

[Seth]

I've not heard of this happening on an Omega, but have on Astras and Vectras ........

There's a possibility here that you've 'flipped' the seals in the master cylinder, when you retracted the brake caliper piston to fit the new pads. Caused by reversing the flow of the fluid against the seals, and will mean a new master cylinder!

However, try a good bleeding first and see what happens.

[Miggy24]

A new master cylinder i hope not.I`ll try with bleeding it first

[VXL V6]

Hi all just fitted some new front brake pads.i took the brake fliuld cap off so when i pushed the piston/s in it wouldnt make to much pressure.Anyway after fitting them i started the car up and pumped the brake pedal it got hard but it went down to the floor.I then took out some brake fluild and the brakes got alot harder and better but still went to the floor.Do you think iv got some air in ther brakes

How much fluid was in the tank?

You did not need to open it really just lift the caliper up, and push it in with a large G-Clamp or something, then pop the new pads in.

Disagree, by doing that you are forcing fluid backwards, I would open the bleed nipple, attach a pipe then push the piston back which would expel the old fluid in the caliper out rather than backwards.

[Miggy24]

So do you think its just abit of air.the brakes are good and hard and stop the car quick like they did before just if i push the brake hard it slowly goes to the floor

[Iain]

Did you bleed them? if so make sure the nipples are tight is they are try bleeding them again mate

[Miggy24]

No i havent tryed to bleed them yet as im all by myself and no one to lend a hand.well take it to my mates in the next day or 2

[Kevin Wood]

So do you think its just abit of air.the brakes are good and hard and stop the car quick like they did before just if i push the brake hard it slowly goes to the floor

If the pedal is not spongy but gradually sinks to the floor under prolonged pressure the fluid is leaking past a seal somewhere. Check each of the calipers as you will see fluid leaking from these. If nothing evident it's probably the master cylinder.

I agree it's good practice to open the bleed nipple when retracting the cylinder. The fluid in the cylinder will be manky so may as well get rid of it. I normally flush a bit of fresh fluid through the system using a pressure bleeder whenever I've worked on the brakes both to bleed it and to effect a partial fluid change.

Kevin

[Miggy24]

If the pedal is not spongy but gradually sinks to the floor under prolonged pressure the fluid is leaking past a seal somewhere. Check each of the calipers as you will see fluid leaking from these. If nothing evident it's probably the master cylinder.


Thats how the brake pedal feels.Shall i still try giving it a bleed or just get a new master cylinder

[Marks DTM Calib]

Right....a litle trick from Astra/Corsa's.

Get a rubber mallet and press the brake pedal right to the floor.

Let go of the brake pedal and as you do, get somebody to wallop the end of the master cylinder with the mallet.

[Miggy24]

 :-? what would that do

[Marks DTM Calib]

:-? what would that do

It corrects inverted seals!

[Miggy24]

Ohhh i see well i`ll give that a try thanks for that mate