brake problem question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

v62go · 09-19-2012, 01:58 PM

i have a 69 cst that came from the factory with manual drum brakes...my problem is that when i do a series of short stops one or the other front wheel locks up and after a few times the pedal gets hard and gets a funny smell to it....has anyone had this type problem?

nra4life · 09-20-2012, 01:21 AM

If I understand your post, it seems that your master cylinder piston is not fully retracting. If the return hole is not able to let the fluid return to the reservoir, pressure will begin to go up so that the brakes start to drag. Usually, the problem is that the push rod is too long. Sometimes, rust will build up in the cylinder bore and hold the piston forward just enough to block the return hole. I hope these suggestions will give you a place to start to fix the problem. Roy

v62go · 09-20-2012, 01:41 AM

Quote:

Originally Posted by nra4life

If I understand your post, it seems that your master cylinder piston is not fully retracting. If the return hole is not able to let the fluid return to the reservoir, pressure will begin to go up so that the brakes start to drag. Usually, the problem is that the push rod is too long. Sometimes, rust will build up in the cylinder bore and hold the piston forward just enough to block the return hole. I hope these suggestions will give you a place to start to fix the problem. Roy

thanks roy,im going to switch it out this weekend...

**lolife99** · 09-20-2012, 08:26 AM

Maybe a leaking wheel cylinder.

v62go · 09-27-2012, 01:32 AM

changed the master cylinder and even added a power brake booster but still having the same problem...

bo21 · 10-03-2012, 02:21 AM

Change out the rubber lines if you havent already the older they get the more they swell inside.

09-19-2012, 01:58 PM	#1
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	brake problem question i have a 69 cst that came from the factory with manual drum brakes...my problem is that when i do a series of short stops one or the other front wheel locks up and after a few times the pedal gets hard and gets a funny smell to it....has anyone had this type problem?

09-20-2012, 01:21 AM	#2
nra4life Registered User Join Date: Sep 2009 Location: Lee's Summit, Missouri Posts: 24	Re: brake problem question If I understand your post, it seems that your master cylinder piston is not fully retracting. If the return hole is not able to let the fluid return to the reservoir, pressure will begin to go up so that the brakes start to drag. Usually, the problem is that the push rod is too long. Sometimes, rust will build up in the cylinder bore and hold the piston forward just enough to block the return hole. I hope these suggestions will give you a place to start to fix the problem. Roy

09-20-2012, 08:26 AM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: brake problem question Maybe a leaking wheel cylinder. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

09-27-2012, 01:32 AM	#5
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	Re: brake problem question changed the master cylinder and even added a power brake booster but still having the same problem...

10-03-2012, 02:21 AM	#6
bo21 Registered User Join Date: May 2011 Location: burleson tx. Posts: 13	Re: brake problem question Change out the rubber lines if you havent already the older they get the more they swell inside.



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