6 replies to this topic

[SKIDDERWOLF]

Replaced front brake shoes (Twin Leading) but now have a judder when braking from 40 ish mph. Can feel through the brake pedal and the car. Not detectable at slower speeds anyone had this Is this part of the bedding in process or could by front drums be out of true? I have only just got the car on the road so I cannot say what they were like previously.

[Stiggytoo]

I experienced this with some cheap minifin copies. The drum retaining screw didn't line up exactly with the hole, pulling it off centre. Solution was to bin the screw. Make sure all mating surfaces are clean.

[Spider]

Seems a little odd that you'd get Judder following a shoe replacement. I think you'd be hard pressed to do so, but to ask the question, you did fit the shoes on the right way? They do have a leading and trailing edge and if fitted the wrong way, can make the shoes behave this way - or if the linings were boded to the frame in the wrong location, likewise, it can do this.

 

The other thing to check and as hinted at with Stiggyloo's post ^ is to be sure the Drum is centering properly. There's a machined spigot inside the drum that locates and centres the drum over the drive flange (or hub on the rears). I was supplied drums a little while back that had this spigot machined (from new!) oversize and so the drum would never be on centre and do just as your car is now.

 

<Edit for my crap spelling >

Edited by Moke Spider, 28 July 2016 - 08:29 PM.

[SKIDDERWOLF]

Thanks Stiggytoo & Mokespider for the replies, I need to check to see if the shoes are fitted the the correct way round. I'm not sure how old the drums are but will have a look for the location spigot.

[Spider]

I found a couple of photos which may help show where the spigot is

 

This is one with a drum and the drive flange sitting / located in to the spigot

 

 

 

and again with the drive flange lifted out

 

 

 

This is the Front Left Drum Brake. Note the 'window' in the shoe (aqua arrow) and the Leading / Trailing edges of the linings and where they are set on the shoe frame

 

[tiger99]

Should the leading edge of the lining be chamfered? On many cars, not just Minis, that is found to be necessary to prevent judder.

[SKIDDERWOLF]

Thanks for the help. I have checked today and I have the drum fitting correctly and the shoes fitted correctly-  however I have noticed that the shoes have not bedded in to the drum completely yet. If I look at the shoes there are still areas that have not touched the drum as they look fresh. I will get it out on the road and give it a few more miles to see if the juddering improves of hopefully stops.