![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,772
|
Brake pedal goes to floor
I have a 70 4 wheel manual drum truck, and the pedal goes to the floor. Upon investigation, the back of the master cylinder is empty, and the front is down a little, (although the front may have been what spilled when I took the cap off). My question is, does the back of the master cylinder feed the back brakes, or is it separated? I see the line from the back of the master goes into the distribution block, but does it stay separate from the front? I pulled both back drums and didn't see any obvious leaks on the wheel cylinders. Since the truck sits a lot though, could it be possible that if a wheel cylinder was leaking, the fluid could have dried up? If nothing else, I'll dump more fluid in the master, and see if I can see where it's leaking, but I figured I'd start here, and see if anyone had any tips.
__________________
70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Aug 2012
Location: Topeka Kansas
Posts: 2,655
|
Re: Brake pedal goes to floor
If one half of the reservoir is dry then there is definitely a leak somewhere.
The front half goes to the front and the back half goes to the back. The leak could be from a loose fitting, a rusted line, a bad rear brake hose, or a bad drum brake cylinder. Time to do some trouble shooting. Last edited by Xeen; 10-16-2014 at 05:46 PM. |
![]() |
![]() |
![]() |
#3 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,772
|
Re: Brake pedal goes to floor
Thanks Brian. I wasn't sure whether something changed as it went through the distribution block. I'll fill the master and see what happens.
__________________
70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Aug 2012
Location: Topeka Kansas
Posts: 2,655
|
Re: Brake pedal goes to floor
If you have never replaced the drum brake wheel cylinders then I would replace them just to replace them unless of course you get in there and they still look new.
|
![]() |
![]() |
![]() |
#5 | |
Registered User
Join Date: Feb 2009
Location: southeasternfoothillsofusa
Posts: 1,557
|
![]() Quote:
sam |
|
![]() |
![]() |
![]() |
#6 |
Registered User
![]() Join Date: Feb 2007
Location: Laughlin,Nv
Posts: 141
|
Re: Brake pedal goes to floor
Check and make sure it's not leaking out back of mc into booster
|
![]() |
![]() |
![]() |
#7 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,772
|
Re: Brake pedal goes to floor
No booster Frank, so that eliminates that problem. I will check to make sure its not leaking out of the m/c onto the firewall though. Thanks!
__________________
70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
![]() |
![]() |
![]() |
#8 |
Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,702
|
Re: Brake pedal goes to floor
Did you ever determine the cause of this problem? I have the same situation.
__________________
"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Nov 2007
Location: Indianapolis
Posts: 1,161
|
Re: Brake pedal goes to floor
maybe a good time to add disc brakes to the front, new rear wheel cyls, & a new master cyl combo. overhaul your whole brake system
|
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Sep 2015
Location: danbury, ct.
Posts: 568
|
Re: Brake pedal goes to floor
Pull the mat or carpet back on the upper drivers side. I bet the master cylinder is leaking.. That was probably the original posters problem also...
|
![]() |
![]() |
![]() |
#11 |
Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,702
|
Re: Brake pedal goes to floor
I'm considering that too but a new MC is so cheap. I did find a complete power disc conversion kit for $575.
__________________
"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|