Mystery brake rotors

[Hpoirier15]

Hey folks, new guy to the group here! I just bought a 1994 c3500hd dually with a dump body. I am having a hard time identifying the rear brake rotors so that I can order new ones. The truck has four wheel disk. The pads on the rear have a metal bracket (part number MKD149) on the bottom that is supposed to ride in a groove next to the face of the rotor. All of the replacement rotors that I have found do not have this groove and make me think they wouldn’t work. Anyone know the part number for this grooved rotor or any advice on how to proceed buying new rotors?

Thanks

 

[Caman96]

Those rear disc brakes were added and not original as far as I know. Although I found this.

5736 Bendix MKD149 Disc Brake Set Semi-Metallic NEW GM Truck 88-92 Mopar 94-99

5736 Bendix MKD149 Disc Brake Set Semi-Metallic NEW GM Truck 88-92 Mopar 94-99

www.aisdai.com

 

[someotherguy]

Those rear disc brakes were added and not original as far as I know. Although I found this.

5736 Bendix MKD149 Disc Brake Set Semi-Metallic NEW GM Truck 88-92 Mopar 94-99

5736 Bendix MKD149 Disc Brake Set Semi-Metallic NEW GM Truck 88-92 Mopar 94-99

www.aisdai.com

3500HD's are 4 wheel disc. Only GMT400 that has 'em. Haven't experienced OP's issue with replacement rotors though as I hadn't had to replace any.

Richard

 

[someotherguy]

Hey folks, new guy to the group here! I just bought a 1994 c3500hd dually with a dump body. I am having a hard time identifying the rear brake rotors so that I can order new ones. The truck has four wheel disk. The pads on the rear have a metal bracket (part number MKD149) on the bottom that is supposed to ride in a groove next to the face of the rotor. All of the replacement rotors that I have found do not have this groove and make me think they wouldn’t work. Anyone know the part number for this grooved rotor or any advice on how to proceed buying new rotors?

Thanks

Many parts sites aren't good at differentiating between a regular 3500 and the 3500HD. Have you tried NAPA (napaonline dot com) - as they do have a specific choice for the 3500HD and you'll see 3 choices of rear rotors. Do any of those look like what you currently have?

Richard

 

[Caman96]

3500HD's are 4 wheel disc. Only GMT400 that has 'em. Haven't experienced OP's issue with replacement rotors though as I hadn't had to replace any.

Richard

Never knew that, but I had a feeling that was coming.

 

[someotherguy]

Never knew that, but I had a feeling that was coming.

No worries. Once you get below the body, they're practically a whole different truck.

Richard

 

[454cid]

The pads on the rear have a metal bracket (part number MKD149) on the bottom that is supposed to ride in a groove next to the face of the rotor. All of the replacement rotors that I have found do not have this groove

I don't have an HD, but do know some details about them from reading about them over the years. I'm confused by your post after reading it several times. If the pads ride in a grove next to the face of the rotor, how would the rotor have a groove?

Are these your rotors? https://www.rockauto.com/en/moreinfo.php?pk=7539100&cc=1353114&pt=1896&jsn=1613

 

[Schurkey]

The C3500HD brake calipers are by Bendix, not Delco like all the other GMT400s.

The front and rear brake calipers are like the old "Ford" calipers--high friction sliding calipers that ride on a tiny leaf spring and "support key", and retained by a large-headed Allen-socket bolt--not low-friction "floating" Delco calipers.

 

[SUBURBAN5]

Never knew that, but I had a feeling that was coming.

I never knew that either. Funny because I just got done telling somebody here that they only came with drums on the rear.

 

[Schurkey]

The pads on the rear have a metal bracket (part number MKD149) on the bottom that is supposed to ride in a groove next to the face of the rotor.

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If the pads ride in a grove next to the face of the rotor, how would the rotor have a groove?

If he's talking about the "bracket" ON THE PAD:
1. It's not a bracket
2. That's the pad backing-plate
3. It doesn't go against the rotor, it locks over/into the caliper. Squeeze the pad over the caliper body.

The only other "bracket" I can think of on that system is the support key plus leaf-spring; it crams into place below the caliper on the steering knuckle, and is retained with a single allen-socket-headed bolt.

Page 5B2-6 of the '97 service manual. Perhaps another page on a different-year manual.