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

frsyth72 · 09-17-2004, 11:58 AM

The other day I was pulling into the parking space at and the brake pedal when straight to the floor

I was in luck though and there was this acura that was able to stop me, no damage to my truck but took out the whole finder of the car. Anyways after I got stopped I noticed a Puddle of brake fluid under the truck by the front passanger tire, but couldn't find a leak any where. When we got the truck home I started bleeding the brakes,(still couldn't find any leaks). Now I know when you are bleeding brakes you start furtherst from the master cylander, but it looked like the fliud came from the front so I wanted to check there, but they both had really good pressure. then to the back, nothing, the driver side would give about one drop of fluid out the even less out of the passanger. I pulled the drum off the passanger side and the whole brake was soaked on the inside by this goo that looked like brake fluid, grease and gear oil. I was thinking that the wheel cylander just went out, dose any one recommend checking/changing anything else out when I got to replace the cylander?? Plus it is fun because I just had surgury on my shoulder so I am trying to do it all one handed, at lease the wife will help me move the 33"s off :p thank you for any advise one what else I should check.

Prerunner1982 · 09-17-2004, 12:30 PM

sounds like a good place to start... i would check all the brake hoses as well.. make sure they are collapsed and cracked and such... might as well change pads/shoes and have the disk/drums turned (unless they are new or done recently)..

frsyth72 · 09-19-2004, 07:17 PM

Okay, I got the wheel cylanders changed out, but I still can't get any pressuse on the pedal. I bleed about 1 and a half of the big things of brake fluid through it using on of those one-man hand pumps. I got a little bit of resistance back on the pedal, but still not enough and when you turn on the truck all of the pressuse goes away. I checked for colapsed lines or leaks but haven't been able to see any. should I keep trying to bleed the brakes or start looking into something else. any thoughts??

beaterC10 · 09-19-2004, 09:09 PM

Do you know for sure the front calipers and master cylinder are good? The puddle on the front could be from the master cylinder, the proportioning valve, or a failed hard line or hose.

I have found that if one part on the brake system quits, it generally means there are more parts waiting to fail. I generally lean more towards the shotgun approach on brakes. My reasoning is that the parts are relatively cheap and I hate going back to repair the brakes.

I would look real close at the rest of the system for leaks. You could also try disconnecting the lines at the master cylinder and putting some lines on from the outlet of the cylinder and submerge them in fluid in the reservoir and see if the master cylinder works.

cliffsta · 09-19-2004, 09:13 PM

Quote:

Originally Posted by beaterC10

I have found that if one part on the brake system quits, it generally means there are more parts waiting to fail. I generally lean more towards the shotgun approach on brakes. My reasoning is that the parts are relatively cheap and I hate going back to repair the brakes.

Exactly. when my dad drove ol red, he always changed EVERY brake thing at once; all the rear stuff, and whatever up front, and the master cylinder poots out regularly.

frsyth72 · 09-20-2004, 03:06 PM

Thanks. The front calipers looked good and I havn't seen any leaks around, the front was completly dry. I will go a head a throw on a new master cylinder and proportioning valve on tonight and hopefully that will get it stopping again. Thank you again

cliffsta · 09-19-2004, 09:03 PM

master cylinder?

09-17-2004, 11:58 AM	#1
frsyth72 Registered User Join Date: Dec 2003 Location: Yuma, AZ Posts: 23	'76 brake help The other day I was pulling into the parking space at and the brake pedal when straight to the floor I was in luck though and there was this acura that was able to stop me, no damage to my truck but took out the whole finder of the car. Anyways after I got stopped I noticed a Puddle of brake fluid under the truck by the front passanger tire, but couldn't find a leak any where. When we got the truck home I started bleeding the brakes,(still couldn't find any leaks). Now I know when you are bleeding brakes you start furtherst from the master cylander, but it looked like the fliud came from the front so I wanted to check there, but they both had really good pressure. then to the back, nothing, the driver side would give about one drop of fluid out the even less out of the passanger. I pulled the drum off the passanger side and the whole brake was soaked on the inside by this goo that looked like brake fluid, grease and gear oil. I was thinking that the wheel cylander just went out, dose any one recommend checking/changing anything else out when I got to replace the cylander?? Plus it is fun because I just had surgury on my shoulder so I am trying to do it all one handed, at lease the wife will help me move the 33"s off :p thank you for any advise one what else I should check.

09-19-2004, 07:17 PM	#3
frsyth72 Registered User Join Date: Dec 2003 Location: Yuma, AZ Posts: 23	Need more advice Okay, I got the wheel cylanders changed out, but I still can't get any pressuse on the pedal. I bleed about 1 and a half of the big things of brake fluid through it using on of those one-man hand pumps. I got a little bit of resistance back on the pedal, but still not enough and when you turn on the truck all of the pressuse goes away. I checked for colapsed lines or leaks but haven't been able to see any. should I keep trying to bleed the brakes or start looking into something else. any thoughts??

09-20-2004, 03:06 PM	#6
frsyth72 Registered User Join Date: Dec 2003 Location: Yuma, AZ Posts: 23	Thanks Thanks. The front calipers looked good and I havn't seen any leaks around, the front was completly dry. I will go a head a throw on a new master cylinder and proportioning valve on tonight and hopefully that will get it stopping again. Thank you again

09-19-2004, 09:03 PM	#7
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	master cylinder? __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

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09-17-2004, 12:30 PM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	sounds like a good place to start... i would check all the brake hoses as well.. make sure they are collapsed and cracked and such... might as well change pads/shoes and have the disk/drums turned (unless they are new or done recently)..

09-19-2004, 09:09 PM	#4
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	Do you know for sure the front calipers and master cylinder are good? The puddle on the front could be from the master cylinder, the proportioning valve, or a failed hard line or hose. I have found that if one part on the brake system quits, it generally means there are more parts waiting to fail. I generally lean more towards the shotgun approach on brakes. My reasoning is that the parts are relatively cheap and I hate going back to repair the brakes. I would look real close at the rest of the system for leaks. You could also try disconnecting the lines at the master cylinder and putting some lines on from the outlet of the cylinder and submerge them in fluid in the reservoir and see if the master cylinder works.



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