CPP rear disc question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

novice · 11-13-2019, 08:16 PM

Is this the normal surface area coverage for rear brakes? Seems awfully small surface coverage.

novice · 11-13-2019, 08:49 PM

Any help appreciated.

geezer#99 · 11-13-2019, 09:41 PM

Looks right.
Rear brakes only do 30% of the braking so no huge Calipers are needed.

novice · 11-13-2019, 10:04 PM

Quote:

Originally Posted by geezer#99

Looks right.
Rear brakes only do 30% of the braking so no huge Calipers are needed.

Thank you. Just looks odd to me.

**BigBird05** · 11-13-2019, 10:11 PM

You should have full pad contact.

**clay68c10** · 11-13-2019, 10:42 PM

Definitely not getting full pad contact. How many miles have you driven it? The pads don’t always make even contact right out of the box, but should wear in within a couple of miles.
It looks like the bracket/caliper is a bit too far out (or maybe crooked) but I’m not familiar that particular setup.

KMC3420 · 11-13-2019, 10:52 PM

I agree, looks like the pad is not making full contact. Do you have any miles on this setup?

Is this the kit?
CPP kit

novice · 11-14-2019, 08:11 AM

Quote:

Originally Posted by KMC3420

I agree, looks like the pad is not making full contact. Do you have any miles on this setup?

Is this the kit?
CPP kit

I don't even have a full mile on it yet.

Yes it is a CPP setup.

KMC3420 · 11-14-2019, 11:40 AM

Quote:

Originally Posted by novice

I don't even have a full mile on it yet.

Yes it is a CPP setup.

Is the brake pad extending past the rotor any? The picture makes it look that way, but that might not be the case.

novice · 11-14-2019, 11:52 AM

Quote:

Originally Posted by KMC3420

Is the brake pad extending past the rotor any? The picture makes it look that way, but that might not be the case.

I'll take a look and better pictures this afternoon.

novice · 11-15-2019, 10:32 AM

Quote:

Originally Posted by novice

I'll take a look and better pictures this afternoon.

Apparently I can't upload pictures now.

However, only the top section of the brakes are touching and the pads do not extend past the rotor. So like previously suggested, the brakes may just have to be "worn in" more.

**BigBird05** · 11-15-2019, 11:21 AM

What does the contact pattern look like on the back side? Brakes should fit when installed, not have to "wear in" to get full contact. You should contact CPP.

KMC3420 · 11-15-2019, 11:24 AM

Quote:

Originally Posted by novice

Apparently I can't upload pictures now.

However, only the top section of the brakes are touching and the pads do not extend past the rotor. So like previously suggested, the brakes may just have to be "worn in" more.

If you have 100% brake pad contact on your rotor then it is setup as it should be. Putting some miles on it will show you the wear pattern and you will be able to better determine at that time. My wife's Subaru has small rotors and pads such as yours on the rear, but the front is much beefier, as I suspect your truck is as well. What do you mean by only the top section of the brakes are touching?

KMC3420 · 11-15-2019, 11:39 AM

Quote:

Originally Posted by BigBird05

What does the contact pattern look like on the back side? Brakes should fit when installed, not have to "wear in" to get full contact. You should contact CPP.

This is accurate, the Brake pads should sit parallel to the rotor. Are you stating that the brake pad is only touching the rotor in the area in red below, hence the original pattern we are seeing. It appears based on what you are saying the brake pad is only engaging the rotor 1/4 of the way, and it should have a full wear pattern, the width of the brake pad, on your rotor. Did your brake conversion kit come with any shims for behind the mounting bracket?

novice · 11-15-2019, 11:55 AM

Maybe they'll work

novice · 11-15-2019, 11:57 AM

Couple more

novice · 11-15-2019, 11:59 AM

Last two

**BigBird05** · 11-15-2019, 07:47 PM

The photo in frame #15 looks like the inside brake pad is very small. It should be the same size as the out side pad. You might have the wrong set of pads.

novice · 11-15-2019, 09:19 PM

Quote:

Originally Posted by BigBird05

The photo in frame #15 looks like the inside brake pad is very small. It should be the same size as the out side pad. You might have the wrong set of pads.

Perhaps. I've verify but as you can see in the next to last photo, the coverage area of the inside pad is nearly the entire rotor surface.

11-13-2019, 08:49 PM	#2
novice Registered User Join Date: Dec 2013 Location: washington north carolina Posts: 123	Re: CPP rear disc question Any help appreciated.

11-13-2019, 09:41 PM	#3
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: CPP rear disc question Looks right. Rear brakes only do 30% of the braking so no huge Calipers are needed.

11-13-2019, 10:11 PM	#5
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: CPP rear disc question You should have full pad contact.

11-13-2019, 10:42 PM	#6
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,882	Re: CPP rear disc question Definitely not getting full pad contact. How many miles have you driven it? The pads don’t always make even contact right out of the box, but should wear in within a couple of miles. It looks like the bracket/caliper is a bit too far out (or maybe crooked) but I’m not familiar that particular setup. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

11-13-2019, 10:52 PM	#7
KMC3420 Registered User Join Date: Dec 2012 Location: Harrison, AR Posts: 1,069	Re: CPP rear disc question I agree, looks like the pad is not making full contact. Do you have any miles on this setup? Is this the kit? CPP kit Attached Images __________________ Keagan 68 SWB C-10 original 350 A/C 503 Mean Green Last edited by KMC3420; 11-13-2019 at 10:57 PM.

11-13-2019, 08:16 PM	#1
novice Registered User Join Date: Dec 2013 Location: washington north carolina Posts: 123	CPP rear disc question Is this the normal surface area coverage for rear brakes? Seems awfully small surface coverage. Attached Images

11-15-2019, 11:21 AM	#12
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: CPP rear disc question What does the contact pattern look like on the back side? Brakes should fit when installed, not have to "wear in" to get full contact. You should contact CPP.

11-15-2019, 11:55 AM	#15
novice Registered User Join Date: Dec 2013 Location: washington north carolina Posts: 123	Re: CPP rear disc question Maybe they'll work Attached Images

11-15-2019, 11:57 AM	#16
novice Registered User Join Date: Dec 2013 Location: washington north carolina Posts: 123	Re: CPP rear disc question Couple more Attached Images

11-15-2019, 11:59 AM	#17
novice Registered User Join Date: Dec 2013 Location: washington north carolina Posts: 123	Re: CPP rear disc question Last two Attached Images

11-15-2019, 07:47 PM	#18
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: CPP rear disc question The photo in frame #15 looks like the inside brake pad is very small. It should be the same size as the out side pad. You might have the wrong set of pads.



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