The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Dustybin on December 28, 2013, 09:18:21 AM

Title: Rear drum brake arm question
Post by: Dustybin on December 28, 2013, 09:18:21 AM

In the image is my drum brake arm. in it is the ferrel which picks up the rod from the foot pedal. My question is should the ferrel rotate in the arm to take up any variation in angle associated with the pedal and rod?
Mine does not but before I put any excessive pressure on it ....should it move or not? :-/

Title: Re: Rear drum brake arm question
Post by: Bob_Roller on December 28, 2013, 09:32:58 AM

Yes, it should move .

Lube it up with a light oil, then put a #2 Phillips screwdriver in the hole and work it loose .

Don't beat on it, it's cast aluminum, won't take too much abuse .

Also, when you reinstall it, the gap in serrated end, goes on the brake shaft with the dimple in the shaft in the gap on the arm .

Title: Re: Rear drum brake arm question
Post by: Dustybin on December 28, 2013, 10:06:13 AM

Thanks Bob it is in a bath of Gt85 at the moment getting right good soaking, I will be gentle with it! Gentle and persistent pressure works every time! ;)

Title: Re: Rear drum brake arm question
Post by: montmil on December 28, 2013, 10:39:55 AM

If what BMW refers to as a "Pin" remains a too snug fit after your soaking efforts, I might suggest using a small amount of fine-cut valve lapping compound on the 'pin' to smooth the I.D. of the aluminum lever. Should not take more than a very few revolutions to develop a satisfactory working clearance.

Title: Re: Rear drum brake arm question
Post by: steve hawkins on December 28, 2013, 02:57:17 PM

of course if you had threaded the brake rod through the lever whilst still attached to the final drive, when you bolted the final drive up, you would have a saved yourself a little bother......

Rev Light.

Title: Re: Rear drum brake arm question
Post by: Dustybin on December 28, 2013, 03:34:41 PM

If it was working properly when you sold it to me I would not have had to straighten the connecting rod... ergo it no longer fits/functions. :D

And gents it is now loose with the application of persistent pressure and GT85.

Monte your suggestion is taken aboard but I am thinking that once clean there will be sufficient free-play for proper function ;)

Title: Re: Rear drum brake arm question
Post by: steve hawkins on December 29, 2013, 11:22:12 AM

you are, of course, correct....

Title: Re: Rear drum brake arm question
Post by: montmil on December 29, 2013, 11:28:42 AM

Boys, boys... No fighting in the War Room.  With apologies to Dr. Strangelove

Title: Re: Rear drum brake arm question
Post by: steve hawkins on January 03, 2014, 04:23:29 AM

Do not worry Monte.  We are not fighting....We both have a very dry sense of humour that often does not translate well over the interweb thingy...

Cheers

Rev Light

Title: Re: Rear drum brake arm question
Post by: montmil on January 03, 2014, 04:24:31 PM

Quote

Do not worry Monte.  We are not fighting....We both have a very dry sense of humour that often does not translate well over the interweb thingy...

Cheers

Rev Light

Sure, I know, Steve.

It's just that the opportunities to use the Strangelove line are few and far between. ;D