Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: alfie1977 on May 24, 2017, 21:41:23

Title: 66 230sl rear wheel squeal
Post by: alfie1977 on May 24, 2017, 21:41:23

Hi all, when rolling at very low speed <10mph I hear a squealing noise from my right rear. I presume it is something on the rear drum brake. Does anyone have any pointers on what to check,adjust or lubricate?
Thanks
Alfie

Title: Re: 66 230sl rear wheel squeal
Post by: DaveB on May 24, 2017, 22:42:43

This thread has some relevant information on adjusting: https://www.sl113.org/forums/index.php?topic=9453

Also, from Al Lieffring: "the 230sl rear drum brakes have a eccentric cam to manually adjust them by two 19 mm hex heads outside on the backing plate"

But I guess the brakes would usually wear loose not tight so perhaps a sticking brake hose, wheel cylinder, or return spring is preventing the linings from springing open when the brakes are released.

Title: Re: 66 230sl rear wheel squeal
Post by: alfie1977 on May 25, 2017, 14:46:52

Thanks Dave, I'm going to jack the car up a bit later and take a look. My mechanic briefly had a look at the brakes around this time last year and thought the brakes were correctly adjusted. He also noted that the noise wasn't present when the wheel was spun with it off the ground. It seems to only squeal when under weight. I've been reading a little on right rear wheel bearing issues and am hoping it isn't anything to do with that. If I touch the brakes the noise does increase so hopefully my first assumption is correct.
Alfie

Title: Re: 66 230sl rear wheel squeal
Post by: alfie1977 on May 27, 2017, 14:05:46

So it turns out my squeal was badly adjusted shoes. Now adjusted correctly
 the squeal has gone! One thing I noticed though was the drum had some float in it (about 0.5 -1mm) is this normal?
Cheers
Alfie