E91 rear caliper

[TheGreatSoprendo]

I'm in the process of replacing a sticking rear caliper but having removed the old one, I notice it is stamped with 42/20 and the new one with 44/22. I'm not sure what these numbers mean, but are the 2 calipers compatible or not?

[helix402]

They are different. The new one has a bigger piston and is standard on the 335d/i and facelift 330d. Also some smaller engined models occasionally.

Edited by helix402 on Saturday 3rd March 13:31

[TheGreatSoprendo]

Thanks fella, that's what I feared. Bugger!

[Sardonicus]

So unusual for ECP to fk up too said in a sarcastic tone like mentioned already not comparable

[Simes205]

Just out of interest have you tried servicing the old calliper?

[TheGreatSoprendo]

Simes205 said:

Just out of interest have you tried servicing the old calliper?

Servicing is probably too strong a word but I've tried cleaning up the piston and cleaning and regreasing the slider pins, all to no avail.

[Simes205]

Piston out, new piston seals?
Out of interest does the rear of your car vibrate at 80+?
Many folk claim it’s a sticky caliper.

[Fastchas]

Simes205 said:

Piston out, new piston seals?
Out of interest does the rear of your car vibrate at 80+?
Many folk claim it’s a sticky caliper.

My E91 has just started doing this. Is it easier to just replace the caliper?

[helix402]

It’s quicker to fit an exchange caliper.

[Sardonicus]

helix402 said:

It’s quicker to fit an exchange caliper.

< What he said

[TheGreatSoprendo]

Fastchas said:

My E91 has just started doing this. Is it easier to just replace the caliper?

That's what I did in the end. Quite a straightforward job, just remember to bleed the brakes afterwards.

[Sardonicus]

Gravity bleeding will work every time no need to pump the pedal slacken nipple wait for fluid to dribble bubble free nip up nipple job done there you go a tip from someone on the tools