help - cruise control not working on E28

[propeller]

Here's what I've tried:

- checked fuse(s)
- checked clutch and brake switches
- swapped cruise control brain
- swapped instrument cluster
- done all checks from Bentley manual
- did checks from purported shop manual
- checked all wiring
- cruise servo does spin
- cruise servo clutch does activate

I can't figure out what else I should test!

I'm resisting swapping the entire servo...

Ideas? :confused:

[Ted in T.O.]

Have you checked your clutch return spring.If you are getting a clunk when you depress the clutch then you compression spring is broken.If this is broken then your cruise control will not engage properly for it to work.You have to order the part from a stealership and it costs $28.20 taxes in.I just ordered one for my M535i and it's comming from the Fatherland in 10 days.I hope this helps.its an easy do it yourself fix but just awkward to replace. Ted in T.O.

[85eta]

^^^ Yes this is exactly the problem my Dad had on his 87 535i. Easy fix.