Porsche Enthusiasts Club Forum

Hi all,

I would like to know what is the right way to bleed my 944 T brakes. I have replaced all discs/pads/master cylinder and fluid. I have used the same bleeding technique as per how I used to with my early VW - car running, start from the furthest away from the MC, keep fluid levels topped up. Myself and my son bleed all with my son operating the brake pedal and myself at each corner. I still feel the brakes to be spongy and the brake bite isn't great. I have driven my car for about 50 miles and have bled after with the same spongy results.

Any help please as I'm out of ideas.

I get this. I think the brake pads take a good few hundred miles to bed in and don't get fully in until they've been cooked a couple of times once run in a bit.

You don't need to have the engine running at all, pointless

With brembo's bleed the inner pistons first then the outers

And the longest pipe is the NS rear, if it's an ABS car.

And I would make sure you get the ABS to activate under braking a few times, just in case there is any air trapped in the valves and pistons

Thank you, it's a '86 model 944 turbo none ABS model. I did start bleeding from the offside.

I will get more miles in then bleed with the engine off.

I have read that having the ignition on helps bleed the ABS block too. That may be internet BS though...

It is Bull

As the abs does not self test till the car is doing 5mph, its only an electronics test before that

Best advice is to get a brake bleeding kit. It's much easier and much more reliable. Well worth the £20 or so you'll spend on it.


Oli.

OK . So what you posted about getting the ABS to activate a few times, do you mean just prior to bleeding ?

If you have bled them once and they are still a bit on the soft side, find some grass and slow speed test the abs a few times then bleed them again

Thanks. Always had a hard pedal, changed the old fluid with a Ezebleed recently and didn't notice a lot of difference TBH.

They are handy if you are lacking a second person though . I have have mixed responses from the one-man bleeding kits though. OTOH I do like a firm pedal.

How far down did your son push the brake pedal, in other words how far did it sink when you opened bleeders?

I thought it was prudent to only push the pedal down halfway ? I have some new rear discs to fit, while I'm there I may give the rear calipers a quick bleed using someone on the pedal this time.

Yes you don't want to push pedal beyond its normal travel, into part of bore which is likely corroded.

The spongey pedal may just be air trapped in system, but it could be symptom of damaged master cylinder where fluid is bypassing the seal.

I would say from a personal perspective,,,

If you cant push the pedal all the way down because there maybe some corrosion in that half of the cylinder then it needs replacing anyway.

the master cylinder is just about the last place i would want to find any hidden corrosion that could possibly affect braking performance.