MBM front disc brake problem? Question? Help!

Sahara · Aug 27, 2017

So I bought the MBM front disc brake conversion kit for my '70 Coronet.
All installed well UNTIL I get to the part where I place the caliper and pads on the bracket. They won't fit onto the rotor. Hhmmm...
The pads together are 1.2 inches thick, the rotor is 1.0 inches thick for a total of 2.2 inches. The opening in the caliper is 2.075 inches. Not gonna fit.
So here's my problem: is my rotor or pads too thick, or is my caliper wrong?
There's more to my story. I'm in the Arctic. Everything must be slowly and expensively shipped in. So I can't just go to the corner store and shop. But I want to do this safely and properly, so I don't want to machine my rotor if the caliper or pads are wrong, don't want to change the caliper if the pads or rotor are wrong. Does anyone know the proper measurements and what part(s) I need to change?

6290988 · Aug 28, 2017

I used the same kit. My caliper had to be compressed a little bit. Did you try doing that yet?

Sahara · Aug 28, 2017

I'll try that. How hard did you have to press? Hand tight or vice?

Fran Blacker · Aug 28, 2017

I use a large C-clamp to compress caliper puck. Pictures would help.

69a100 · Aug 28, 2017

Keep the bleeder valve open too, makes some mess with fluid, but makes compressing the piston easier. Good Luck
Man, you must also be getting close to when the snow starts to fly?

Sahara · Aug 28, 2017

69a100 said:
Keep the bleeder valve open too, makes some mess with fluid, but makes compressing the piston easier. Good Luck
Man, you must also be getting close to when the snow starts to fly?

It's still pretty warm here during the day but the nights are starting to cool. No frost yet. Snow usually in mid October, ALWAYS by Halloween.

Sahara · Aug 28, 2017

Hey, I used a carpenters "C" clamp with a piece of wood for a pad. Squeezed the piston in EASY! Calipers now fit slick. A super thank you for the help!

Sahara · Sep 4, 2017

6290988 said:
I used the same kit. My caliper had to be compressed a little bit. Did you try doing that yet?

Hey, what size wheels did you run? Do you think 14's will fit?

miller · Sep 4, 2017

Pretty sure your going to need 15"s, to get the clearance.

6290988 · Sep 6, 2017

Sahara said:
Hey, what size wheels did you run? Do you think 14's will fit?

You need 15's or bigger.

Fran Blacker · Sep 6, 2017

I agree 15" wheels but there are some disc kits that 14" will work. If your buying wheels get 15".

Billccm · Sep 6, 2017

This kit Sahara is using might be similar to the Dr Diff kit. I kept my 14 inch wheels and used the Dr Diff front conversion kit with no fitment issues.

MBM front disc brake problem? Question? Help!

Sahara

FBBO Gold Member

6290988

Well-Known Member

Sahara

FBBO Gold Member

Fran Blacker

FBBO Gold Member

69a100

Well-Known Member

Sahara

FBBO Gold Member

Sahara

FBBO Gold Member

Sahara

FBBO Gold Member

miller

Well-Known Member

6290988

Well-Known Member

Fran Blacker

FBBO Gold Member

Billccm

FBBO Gold Member

Similar threads