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| | | | Joined: Oct 2017 Posts: 32 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 32 | Hi All,ive got a 52 chevrolet 6400 truck.I have renewed all the brake cylinders front and back the master cylinder is new the hydrovac to is good,I am having trouble getting a stiff pedal. I have bled as the manual says. If i clamp off the rear flexi pipeiget a stiff pedal so I am guessing the problem is at the rear.I have adjusted the shoes and bled the cylinders but still no pedal.Although there are two brake cylinders per wheel station only one of the cylinders has a bleed nipple could there be trapped air if so how can i fix the problem. many thanks for reading. Howard
Last edited by Howardwade; 08/29/2018 4:21 AM.
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | "52 chevrolet 6400 truck." - 2 ton "I have bled as the manual says." Pressure BleedingDid you use a pressure bleeder? Did you bleed in the described order - wheel order, and cylinder order, and then, hydrovac? | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Howardwade, this may sound like a silly question but, on your rear brake cylinders are the bleed screws in the uppermost port of the upper wheel cylinder? | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Seem like my book says hydrovac first?
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | What year/make/size truck is your book for, Ed 1954 Chevrolet says bleed the hydrovac first - the earlier book that I linked-to above states differently. I think the system in question in this post is 1952 (the manual that I linked-to earlier). Actually, there is a 1952 "addenda" to that manual: I'll try to remember to check it out tomorrow. Thanks | | | | | Joined: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | on my 55.2 and my 58, one of the rear brake shoes has to be adjusted all the way loose (collapses the wheel cylinder) when bleeding, then you adjust the brakes.... yours may be the same? Double check the procedure in the manual. | | | | | Joined: Oct 2017 Posts: 32 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 32 | Hello chaps. I have bled as the manual says. Hydrovac first then cylinders. | | | | | Joined: Aug 2018 Posts: 44 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2018 Posts: 44 | There is an online 1951 1.5 and 2 Ton Brake Service Manual that has helpful pictures.
But that method uses a pressure bleeder tank tool.
http://chevy.oldcarmanualproject.com/booklets/51mts06/5106mtsindex.html
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Same equipment & procedure as shown in 48-51 Shop Manual in a post above.
There are more and better pictures at your link, though, Soggy - Thanks | | | | | Joined: Oct 2017 Posts: 32 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 32 | Still having trouble ijust cannot get a pedal. i have bled and bled the system. I have clamped the year flexi andyou can get a pedal. Sothe fault is at the rear end. | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | Does your Hydrovac work? Are you pressure bleeding the system? Do you get a hard pedal when you clamp both fronts? Have you ever had the brakes "work good"? What's new in the system (MC, Wheel Cylinders, Hydrovac etc.)? Mike B  | | |
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