![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: May 2007
Location: usa
Posts: 71
|
Help:air in front brake lines
Hi guys, Try to make this quick....1970 Chevy LWB pick-up. Still has original front drums. Initial problem: front right brake hanging up causing wheel to heat up/pulling to right. I've replaced master cylinder, front wheel cylinders, front brake hoses, front brake shoes, spring kit, both self adjusters. I'm now battling an endless supply of air into front brake line system. No matter how much I bleed them (pump,pump,pump, push brake pedal down, loosen bleeder, squirt, brake pedal goes to floor, tighten bleeder) I keep getting "milky' brake fluid (air laden) out. When I bleed the rears milky fluid came out at first but then cleared right up and brake pedal stiffened right up. When I bleed fronts...nothing but milky fluid and pedal goes spongy again! What on earth could be wrong? Same fluid used in both front and back...no apparent leaks in lines...One thing that does bother me is that I remember a little copper washer in the past that went between front brake hoses and wheel cylinder...I did not get these with either new parts...but still no leaks there at all...Any feedback surely is appreciated..This truck is wearing my patience as I've been working on this problem since I bought it in late MAY...Thanks guys, Bob
__________________
I'm a grateful Christian not perfect in any way, but always striving to become better with Christ's help. I'm grateful for what He did for me on that cross at Calvary. I hope there is a desire in your heart for the same: If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. Romans 10:9 |
![]() |
![]() |
![]() |
#2 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
|
Re: Help:air in front brake lines
Looks like you're sucking in air from somewhere. First culprit, of course, could be the connections then the brake cylinders themselves.
May have to dismantle each brake cylinder to check the pistons/seals to make sure they're installed correctly or not damaged. If you still can't find, you may have to cap off the front lines one side at a time to see if you can isolate to one side or the other. Also, be sure you have some good quality front brake shoes. I've found some are more grabby than others... |
![]() |
![]() |
![]() |
#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
|
Re: Help:air in front brake lines
you need those copper crush washers for the brake hose to cylinder sealing //available at autoparts stores
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Jul 2006
Location: Fair Oaks, CA
Posts: 475
|
Re: Help:air in front brake lines
Put the copper washers on and gravity bleed them (crack the bleeder and go inside drink a six pack then repeat on other side)
__________________
1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
|
Re: Help:air in front brake lines
Hello Bob:
The copper crush washers may solve this, but I would expect some fluid leaking there if air also were getting into the line at that place. Try checking the master cylinder for sucking in and pumping air on the front side and also check at the steel distribution block below the MCyl (proportioning valve maybe?) for any leakage. Hang in there, take it step by step according to advice given by others, you will get it fixed. Paul Prov. 3:5 and 6
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
![]() |
![]() |
![]() |
#6 | |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
|
Re: Help:air in front brake lines
Quote:
|
|
![]() |
![]() |
![]() |
Bookmarks |
|
|