Disc brake help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AJLChase · 09-19-2011, 08:34 PM

I purchased the Front Disc brake conversion kit from GMCPauls. It's the McGaughy's brand with the 9" booster. We're hitting a snag. The rear brakes seem to be bleeding just fine but the fronts are being difficult. Was wondering if the length of the "Clevis Fork" or rod needs to be screwed so far into the back of the booster to engage the front part of the MC correctly? When I put it on I just screwed it as far as it would go as the directions didn't mention much of anything. We tried blowing air through all of the lines to make sure there is no blockage and everything seemed fine. Once we undid the lines from the Prop valve to the MC we noticed very little if at all brake fluid would stream out of the MC once we depressed the brake peddle. Could this be our culprit?

**lolife99** · 09-19-2011, 10:46 PM

Can you measure the full stroke of the M/C assembly and compare that to what you are actually getting?
You may need to lengthen your brake pedal rod.

AJLChase · 09-23-2011, 07:33 PM

I went ahead and extended the length of the push rod from the brake peddle into the booster and noticed a change. Before we couldn't get any fluid to drain from the front resevoir of the MC and now when I pump the brake it shoots a stream two feet in the air. I have a constant stream coming out of the bleeder valve but I still can't get the brakes to lock up. Trouble shooting tips?

09-19-2011, 08:34 PM	#1
AJLChase Registered User Join Date: May 2009 Location: Lincoln, NE Posts: 322	Disc brake help I purchased the Front Disc brake conversion kit from GMCPauls. It's the McGaughy's brand with the 9" booster. We're hitting a snag. The rear brakes seem to be bleeding just fine but the fronts are being difficult. Was wondering if the length of the "Clevis Fork" or rod needs to be screwed so far into the back of the booster to engage the front part of the MC correctly? When I put it on I just screwed it as far as it would go as the directions didn't mention much of anything. We tried blowing air through all of the lines to make sure there is no blockage and everything seemed fine. Once we undid the lines from the Prop valve to the MC we noticed very little if at all brake fluid would stream out of the MC once we depressed the brake peddle. Could this be our culprit?

09-19-2011, 10:46 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,681	Re: Disc brake help Can you measure the full stroke of the M/C assembly and compare that to what you are actually getting? You may need to lengthen your brake pedal rod. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

09-23-2011, 07:33 PM	#3
AJLChase Registered User Join Date: May 2009 Location: Lincoln, NE Posts: 322	Re: Disc brake help I went ahead and extended the length of the push rod from the brake peddle into the booster and noticed a change. Before we couldn't get any fluid to drain from the front resevoir of the MC and now when I pump the brake it shoots a stream two feet in the air. I have a constant stream coming out of the bleeder valve but I still can't get the brakes to lock up. Trouble shooting tips?



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