Help with brakes 62 c10!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bclanton · 03-05-2012, 02:03 PM

Hey guys Im in need of some help. I have a 62 c10 with brake issues. I have replaced the MC and booster along with the rear brake hose. I have bled the system and I get pressure at the pedal with the engine off but with the engine running I have no pedal. We tried to bleed the system with the engine running and the rear wheel cylinder has very little fluid coming out. It almost seems as if the MC isnt being depressed enough. Does anyone have any suggestions?

Thanks
Brandon

**N2TRUX** · 03-05-2012, 02:54 PM

Did you bench bleed the master cylinder? It very well could be your source of trouble.

Bclanton · 03-05-2012, 04:12 PM

Yes we did bench bleed the MC and again on the truck.

*blackedoutharley* · 03-05-2012, 05:57 PM

Sounds crazy but....

Vac line to booster plugged or not hooked up properly?

Bclanton · 03-05-2012, 05:59 PM

Checked that too even swaped vac lines on the carb to see if its any better. No change.

62 mark · 03-05-2012, 09:24 PM

Did you replace these items because of a problem you were having before?Double check to make sure they gave you a 4 wheel drum master,if that's what you're running.Sounds like just lots of air in the lines tho...

**Captainfab** · 03-06-2012, 02:17 AM

If you have a proportioning valve, and if the rear lines were at one point empty, the valve may have moved and mostly blocked the rear line. This is what it would do if there was a failure in the rear circuit. Check to see if you have good fluid flow at the rear brake port on the master. If so you might try re-setting the prop valve.

Bclanton · 03-06-2012, 01:13 PM

Thanks for the input guys... I will check it out and see if it works. Captainfab how would I go about reseting the porportion valve?

Bclanton · 03-06-2012, 01:18 PM

62 mark, the only problem I had previously was the booster was bad. We replaced it and the MC as an assembly. I wanted to upgrade the MC since I was replacing the booster I didnt think I would run into an issue with doing so. I will change MC with old one to see if that makes the diff. Thanks.

03-05-2012, 02:03 PM	#1
Bclanton Registered User Join Date: Feb 2012 Location: Tyler,TX Posts: 23	Help with brakes 62 c10!! Hey guys Im in need of some help. I have a 62 c10 with brake issues. I have replaced the MC and booster along with the rear brake hose. I have bled the system and I get pressure at the pedal with the engine off but with the engine running I have no pedal. We tried to bleed the system with the engine running and the rear wheel cylinder has very little fluid coming out. It almost seems as if the MC isnt being depressed enough. Does anyone have any suggestions? Thanks Brandon

03-05-2012, 02:54 PM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: Help with brakes 62 c10!! Did you bench bleed the master cylinder? It very well could be your source of trouble. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

03-05-2012, 04:12 PM	#3
Bclanton Registered User Join Date: Feb 2012 Location: Tyler,TX Posts: 23	Re: Help with brakes 62 c10!! Yes we did bench bleed the MC and again on the truck.

03-05-2012, 05:57 PM	#4
blackedoutharley Account Suspended Join Date: Jul 2007 Location: Plumas Lake, Ca. Posts: 1,009	Re: Help with brakes 62 c10!! Sounds crazy but.... Vac line to booster plugged or not hooked up properly?

03-05-2012, 05:59 PM	#5
Bclanton Registered User Join Date: Feb 2012 Location: Tyler,TX Posts: 23	Re: Help with brakes 62 c10!! Checked that too even swaped vac lines on the carb to see if its any better. No change.

03-05-2012, 09:24 PM	#6
62 mark Registered User Join Date: Nov 2009 Location: Tampa Fl. Posts: 103	Re: Help with brakes 62 c10!! Did you replace these items because of a problem you were having before?Double check to make sure they gave you a 4 wheel drum master,if that's what you're running.Sounds like just lots of air in the lines tho...

03-06-2012, 02:17 AM	#7
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,247	Re: Help with brakes 62 c10!! If you have a proportioning valve, and if the rear lines were at one point empty, the valve may have moved and mostly blocked the rear line. This is what it would do if there was a failure in the rear circuit. Check to see if you have good fluid flow at the rear brake port on the master. If so you might try re-setting the prop valve. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-06-2012, 01:13 PM	#8
Bclanton Registered User Join Date: Feb 2012 Location: Tyler,TX Posts: 23	Re: Help with brakes 62 c10!! Thanks for the input guys... I will check it out and see if it works. Captainfab how would I go about reseting the porportion valve? Last edited by Bclanton; 03-06-2012 at 01:19 PM.

03-06-2012, 01:18 PM	#9
Bclanton Registered User Join Date: Feb 2012 Location: Tyler,TX Posts: 23	Re: Help with brakes 62 c10!! 62 mark, the only problem I had previously was the booster was bad. We replaced it and the MC as an assembly. I wanted to upgrade the MC since I was replacing the booster I didnt think I would run into an issue with doing so. I will change MC with old one to see if that makes the diff. Thanks.



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