soft/low brake pedal

[pete30nz]

Does it have abs?

Hi Brisbarnz,
Yes this car does have abs.

Cheers Pete

 

[pete30nz]

For your average daily run around I use and recommend the BNT Cplus in-house brand brake pads. They are a low dust ceramic formulation that work well and are reasonably priced.

Hi Immorality,

I just went and purchased some c-plus pads, so in the next few days, I should be able to fit them.

Cheers Pete

 

[pete30nz]

Hi all,

Today we replaced the 4 seals on the 2 pistons inside the brake master cylinder.
Put it on the car, bled up the system, and the pedal is still going soft when engine is started .

I don't know... So frustrating.

Pete

 

[Immortality]

It can be very difficult to get all the air out of the MC when it's been apart. Do a search on "bench bleeding" a master cylinder.

Have you tried clamping off each caliper and seeing if there is any difference?

 

[pete30nz]

It can be very difficult to get all the air out of the MC when it's been apart. Do a search on "bench bleeding" a master cylinder.

Have you tried clamping off each caliper and seeing if there is any difference?

Hi Immortality,

A few weeks ago I clamped both front brake hoses at same time, started engine and pedal was rock solid.
Then unclamped front, and clamped both rear hoses and pedal was not as solid with engine started.

Pete

 

[pete30nz]

I'm wondering what the other half of the master cylinder does, the part that has the hex key. Wether it could be an issue or not?
I had a 20mm ish O-ring left over from the seal kit and wonder where it should sit.

 

[pete30nz]

Hi the_boozer,

Over a week ago I took a brake booster apart, but at this stage I haven't seen a reaction disc. This brake booster is a PBR brake booster. Wondering if you can tell me if it should have the reaction disc?

Cheers Pete

 

[Immortality]

OK. Can we confirm exactly what booster, Master cylinder and brake calipers you are running. I'm wondering if there is a miss-match of parts possibly?

I'm not 100% sure but I believe the plug with the hex fitting is possibly to adjust the bias between front/rear?

IF you have little to no movement with the brake lines clamped at the caliper it would suggest the issue lies with the Booster/MC.

 

[greenacc]

When you clamped the brake lines did you try and start it to check if pedal went soft?
Is the booster holding vacuum?

 

[pete30nz]

When you clamped the brake lines did you try and start it to check if pedal went soft?
Is the booster holding vacuum?

Hi Greenacc,

Yes when I clamped the 2 front brake lines I then started the car, and pedal was firm as, I then clamped the rear lines started engine and pedal was not as firm.

Correct me if I'm wrong, but with key off after engine running, pedal feels soft, but after 2 max 3 pedal presses, pedal goes firm.
So that would mean booster is holding vacume??

Cheers Pete