Big-Time PROB - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Heavy-Chevy · 12-23-2005, 02:59 PM

rotors are worping on my one ton.
What all can cause this problem?

jsbgump · 12-23-2005, 03:01 PM

heat can cuase it riding the brakes driving under heavy braking condidtions when it's raining sticky calipers etc

Heavy-Chevy · 12-23-2005, 03:10 PM

It is a Bendix calipers.
not riding the brakes, I think i do have heat problems.
When it is cold outside,it does not have much problems
If we are pulling it does not matter.

jsbgump · 12-23-2005, 03:26 PM

what kind of pads are you runnin?

Heavy-Chevy · 12-23-2005, 03:45 PM

Matalic

jsbgump · 12-23-2005, 03:46 PM

how long ago was the brake job done?

torquepower · 12-23-2005, 03:53 PM

If the pedal is not coming back all the way, it will hold the brakes on a little. The pedal has to be back all the way for the ports in the MC to open for fluild to return. Sometimes the spring in the MC can weaken and the weight of the pedal will hold the brakes on some.

If your calipers are all corroded and gungy they won't slide freely, take the pads out and put them back on with the pins and try moving then back and forth, it should be real easy. Lubricate the bushings with high temp grease and clean the caliper and spindle surfaces that come in contact with emery paper.

Also, problems in the combo/prop valve can cause this.

Hope these suggestions help, It could be a number of things, I would start with just checking that everthing moves freely first.

Heavy-Chevy · 12-23-2005, 04:13 PM

I have working on it for months.
Chevy house has looked at (said it was to old for them)
part house ( could not get a porportional valve,if it was the prob.)
Been to other shops too.

What about midas?

crazyred · 12-23-2005, 05:08 PM

Improper torque and tightening pattern on the lug nuts has also been known to cause this. NEVER use an impact to tighten them down. Try to uses a torque wrench to do this so that you know all the nuts are tightened evenly all the way around….. the unevenness can cause worping. Always try to tighten in three stages, 33% of total torque on all the nuts then 66% of torque on all the nuts and then do your final torque 100% of what the torque should be on the nuts. If you do this and always tighten the nut across then hub your rotors will only worpe from heat … and that’s a whole other story!

Tx Firefighter · 12-23-2005, 06:28 PM

Definitely improper torquing of the lug nuts.

OJOE · 12-23-2005, 07:05 PM

one more thing that gets over looked a lot is the brake hose. the inside of the hose will seprate. fluid will pass thru when you apply brakes but when you let off,the hose will suck together and not let the pressure off the calipers. i have seen this a lot on these trucks.

**Stocker** · 12-23-2005, 07:51 PM

More than you ever wanted to know about disc brake problems... http://www.stoptech.com/tech_info/wp...rakedisk.shtml

Heavy-Chevy · 12-24-2005, 12:16 AM

Many thanks guys!!!!!

12-23-2005, 02:59 PM	#1
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Big-Time PROB rotors are worping on my one ton. What all can cause this problem? __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC

12-23-2005, 03:01 PM	#2
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: Big-Time PROB heat can cuase it riding the brakes driving under heavy braking condidtions when it's raining sticky calipers etc __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616 Last edited by jsbgump; 12-23-2005 at 03:01 PM.

12-23-2005, 03:10 PM	#3
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Re: Big-Time PROB It is a Bendix calipers. not riding the brakes, I think i do have heat problems. When it is cold outside,it does not have much problems If we are pulling it does not matter. __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC

12-23-2005, 03:26 PM	#4
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: Big-Time PROB what kind of pads are you runnin? __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

12-23-2005, 03:45 PM	#5
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Re: Big-Time PROB Matalic __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC

12-23-2005, 03:46 PM	#6
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: Big-Time PROB how long ago was the brake job done? __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

12-23-2005, 03:53 PM	#7
torquepower Registered User Join Date: Sep 2005 Location: Mission, BC Canada Posts: 31	Re: Big-Time PROB If the pedal is not coming back all the way, it will hold the brakes on a little. The pedal has to be back all the way for the ports in the MC to open for fluild to return. Sometimes the spring in the MC can weaken and the weight of the pedal will hold the brakes on some. If your calipers are all corroded and gungy they won't slide freely, take the pads out and put them back on with the pins and try moving then back and forth, it should be real easy. Lubricate the bushings with high temp grease and clean the caliper and spindle surfaces that come in contact with emery paper. Also, problems in the combo/prop valve can cause this. Hope these suggestions help, It could be a number of things, I would start with just checking that everthing moves freely first. __________________ 71 GMC 3500 Longhorn 454 72 GMC 2500 Sierra 350 69 C20 Longbox fleetside 305 68 C10 Shortbox Stepside 250 94 Chevrolet K1500 Cheyenne 350 88 GMC K1500

12-23-2005, 04:13 PM	#8
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Re: Big-Time PROB I have working on it for months. Chevy house has looked at (said it was to old for them) part house ( could not get a porportional valve,if it was the prob.) Been to other shops too. What about midas? __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC

12-23-2005, 05:08 PM	#9
crazyred yeeha Join Date: Sep 2005 Location: Sherwood Park & Fort McMurray, Alberta Posts: 72	Re: Big-Time PROB Improper torque and tightening pattern on the lug nuts has also been known to cause this. NEVER use an impact to tighten them down. Try to uses a torque wrench to do this so that you know all the nuts are tightened evenly all the way around….. the unevenness can cause worping. Always try to tighten in three stages, 33% of total torque on all the nuts then 66% of torque on all the nuts and then do your final torque 100% of what the torque should be on the nuts. If you do this and always tighten the nut across then hub your rotors will only worpe from heat … and that’s a whole other story! __________________ 1969 GMC 910 97% rust free 2002 olds Alero 1986 New Yorker 4dr ... the new DD...My POS car... dude its got a turbo!!! Don't drink and drive, you might spill something!!! Daryl Kuchmak

12-23-2005, 06:28 PM	#10
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Big-Time PROB Definitely improper torquing of the lug nuts. __________________ I'm on the Instagram- @Gearhead_Kevin

12-23-2005, 07:05 PM	#11
OJOE Crew Cut Join Date: Dec 2005 Location: MONTGOMERY,AL Posts: 757	Re: Big-Time PROB one more thing that gets over looked a lot is the brake hose. the inside of the hose will seprate. fluid will pass thru when you apply brakes but when you let off,the hose will suck together and not let the pressure off the calipers. i have seen this a lot on these trucks. __________________ 85 SWB 1/2 TON CREWCAB/5.3 03 CHEV 3500 DURAMAX CREW CAB 85 CHEV SWB/TPI 06 CHEV TAHOE (WIFES) 30 MODEL A HOT ROD 07 HARLEY DAVIDSON BAGGER 09 STREET GLIDE AN D A LOT MORE JUNK

12-23-2005, 07:51 PM	#12
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,586	Re: Big-Time PROB More than you ever wanted to know about disc brake problems... http://www.stoptech.com/tech_info/wp...rakedisk.shtml __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

12-24-2005, 12:16 AM	#13
Heavy-Chevy Registered User Join Date: Jul 2000 Location: Ennis (& Styx),Texas Posts: 1,325	Re: Big-Time PROB Many thanks guys!!!!! __________________ TRUCKS & Autos that run: 1972 GMC Sierra Grande 3/4ton LWB 4x4 1972 Chevrollet K/5 with a 6"Lift, 462 heads "money pit" 1988 K3500 Crew "Big Red" 4x4 PARTS OR PROJECT TRUCKS: PARTS for sale or trade: WANT : 1972 parts blazer/Jimmy parts truck 1967-72 Parts Chevy/GMC Truck NEED stainless hubcap for 3/4ton GMC



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