Need Help M/C demensions- Disc/Drum - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jaros44sr** · 03-08-2009, 10:16 AM

I've read a thread on here where it was stated that the front chamber of the M/C is larger then the rear. It makes sense as the capacity would need to be more as the pads wear, and the bore is larger on the disc than the wheel cylinder. I don't doubt this, but my chambers are the same size.

When I bought the new M/C I held them side by side and everything looked the same, that does not mean that the PO didn't change it before me...so, my question is this, can someone verify the actual demension of the front chamber of a M/C with a disc/drum setup from a '72. I don't want to go back to the supply house without some sort of ammo.

Thank You for anyone taking the time to help me out...

ratrod67 · 03-08-2009, 11:16 AM

Here's a couple quick pics. If you need something else let me know.

**jaros44sr** · 03-08-2009, 01:05 PM

Wow, what a difference...as I suspected, the PO changed it to the wrong M/C. Thanks for the speedy response, now I have to take it apart and go back to the parts house

Thanks for taking the time

ratrod67 · 03-08-2009, 01:28 PM

No problem

**jaros44sr** · 03-08-2009, 01:34 PM

Could I bother you for another demension? Center to center on the brake line holes, I'm concerned the new brake lines may be differant

ratrod67 · 03-08-2009, 02:32 PM

These ok?

texanidiot25 · 03-08-2009, 07:03 PM

My disk/drum MC has different sized reservoirs as well. All disk/drums setups are like this now days.

texanidiot25 · 03-08-2009, 07:41 PM

My disk/drum MC has different sized reservoirs as well. All disk/drums setups are like this now days.

**jaros44sr** · 03-08-2009, 08:39 PM

Quote:

Originally Posted by ratrod67

These ok?

Perfect...Thanks again, won't bother you anymore.

That's what is great about this board, information, and good guys willing to share it

03-08-2009, 10:16 AM	#1
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,609	Need Help M/C demensions- Disc/Drum I've read a thread on here where it was stated that the front chamber of the M/C is larger then the rear. It makes sense as the capacity would need to be more as the pads wear, and the bore is larger on the disc than the wheel cylinder. I don't doubt this, but my chambers are the same size. When I bought the new M/C I held them side by side and everything looked the same, that does not mean that the PO didn't change it before me...so, my question is this, can someone verify the actual demension of the front chamber of a M/C with a disc/drum setup from a '72. I don't want to go back to the supply house without some sort of ammo. Thank You for anyone taking the time to help me out... __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

03-08-2009, 11:16 AM	#2
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: Need Help M/C demensions- Disc/Drum Here's a couple quick pics. If you need something else let me know. Attached Images

03-08-2009, 01:05 PM	#3
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,609	Re: Need Help M/C demensions- Disc/Drum Wow, what a difference...as I suspected, the PO changed it to the wrong M/C. Thanks for the speedy response, now I have to take it apart and go back to the parts house Thanks for taking the time __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 03-08-2009 at 01:13 PM.

03-08-2009, 01:28 PM	#4
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: Need Help M/C demensions- Disc/Drum No problem

03-08-2009, 01:34 PM	#5
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,609	Re: Need Help M/C demensions- Disc/Drum Could I bother you for another demension? Center to center on the brake line holes, I'm concerned the new brake lines may be differant __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

03-08-2009, 02:32 PM	#6
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: Need Help M/C demensions- Disc/Drum These ok? Attached Images

03-08-2009, 07:03 PM	#7
texanidiot25 Eat My Rust Join Date: Jan 2007 Location: Cypress, Texas Posts: 3,362	Re: Need Help M/C demensions- Disc/Drum My disk/drum MC has different sized reservoirs as well. All disk/drums setups are like this now days.

03-08-2009, 07:41 PM	#8
texanidiot25 Eat My Rust Join Date: Jan 2007 Location: Cypress, Texas Posts: 3,362	Re: Need Help M/C demensions- Disc/Drum My disk/drum MC has different sized reservoirs as well. All disk/drums setups are like this now days.



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