Puma brake pedal has that sinking feeling...

**ian4002000** · 8th March 2021, 06:05 PM

A Master cylinder shouldn't slowly sink, no matter what !

A trick that mechanics do when changing disc pads and shoes etc is to push the pedal only half way, and then repeat this. If you push the pedal all the way you may push the rubber seal over any debris that can accumulate in the bore of the master cylinder.

Most mechanics have had to replace a master and learn it is easier not to push all the way to floor unless the master cylinder is new ....

I suggest replacing the master cylinder with a quality item and get the brake system power bled.

Ian
Bittern

**Samblers** · 11th March 2021, 08:59 PM

Well, new OEM master cylinder, new fluid and bleed (again) and it does exactly the same.

It has to be something in the ABS box of tricks. Is there a pressure relief circuit in there?

**Samblers** · 12th March 2021, 10:06 AM

Originally Posted by Brid

I recall reading that is a special procedure for flushing the brake fluid, that involves use of a scan tool, to flush out the ABS unit. Wondering if air got in there?.

Originally Posted by ian4002000

I suggest replacing the master cylinder with a quality item and get the brake system power bled.

Air in the ABS module seems likely now... i'll get it power bled as suggested (can't do this myself as dont have the interface)

**Tote** · 12th March 2021, 12:36 PM

I've got my 130 today and went out and checked, the pedal definitely doesn't sink with the engine either on or off.

Regards,
Tote

**Samblers** · 12th March 2021, 03:12 PM

Thanks for checking Tote

If the above is indeed the case, I wouldn't mind betting there are a fair few vehicles out there with same (including my friends)

Cheers, Sam

Thread: Puma brake pedal has that sinking feeling...

Thread Tools

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions