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1948 3600 brakes failed.
#1349165 Sat Mar 07 2020 08:29 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
when first got my restored 1948 3600 chevy, the master cyclinder reservoir was dry. i filled it up and bled the brakes brakes workd fine for about 3 months. i took it out today and went to stop and nothing, right to the floor, looked and master cylinder needed fluid ( a lot). it filled, hand pump a few times to see if i could get air bubbles in MC but nothing. put the cap back on the MC, proceeded to. bleed the brakes and still nothing. looks like a fairly new MC, does this sound like MC failure????


1948 3/4 ton Chevy Pickup
Re: 1948 3600 brakes failed.
MontanaLee #1349166 Sat Mar 07 2020 08:41 PM
Joined: May 2015
Posts: 2,750
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Did you find a puddle of brake fluid anywhere? It had to go somewhere.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: 1948 3600 brakes failed.
klhansen #1349167 Sat Mar 07 2020 09:12 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
that remains a mystery no evidence that i can see.


1948 3/4 ton Chevy Pickup
Re: 1948 3600 brakes failed.
MontanaLee #1349174 Sat Mar 07 2020 09:40 PM
Joined: Mar 2004
Posts: 4,628
M
Shop Shark
Brake fluid doesn't evaporate, so it's either on the floor, puddled up on the frame somewhere or inside a drum...

Mike B smile

Re: 1948 3600 brakes failed.
MontanaLee #1349178 Sat Mar 07 2020 11:10 PM
Joined: Oct 2018
Posts: 67
C
Wrench Fetcher
Does the vehicle have a Hydrovac unit or other vacuum assist ?

Re: 1948 3600 brakes failed.
Mike B #1349183 Sat Mar 07 2020 11:49 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
no just drump brakes-----

also does not explain why i don't seem to be able to bleed the brakes now. i will check the wheel cylinders , it is my only guess now- leaky wheel cylinder.


1948 3/4 ton Chevy Pickup
Re: 1948 3600 brakes failed.
MontanaLee #1349217 Sun Mar 08 2020 02:36 AM
Joined: Mar 2004
Posts: 4,628
M
Shop Shark
Originally Posted by MontanaLee
also does not explain why i don't seem to be able to bleed the brakes now. i will check the wheel cylinders , it is my only guess now- leaky wheel cylinder.


Am I understanding you correctly...with a full MC you can't get any fluid to come out of the bleeders. Even if the wheel cylinders are leaking, you should still get fluid out of them when you open the bleeder valve.

Are your brake lines all new or recently replaced (steel and rubber)?

As you said, it's time to pull all four drums and inspect for leaks...

Mike B smile

Re: 1948 3600 brakes failed.
MontanaLee #1349240 Sun Mar 08 2020 12:40 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
no i was able to get fluid out of bleeders, with no air. next stop pulling the drums


1948 3/4 ton Chevy Pickup
Re: 1948 3600 brakes failed.
MontanaLee #1349298 Mon Mar 09 2020 01:13 AM
Joined: Mar 2019
Posts: 1,022
G
Shop Shark
If the brakes failed and peddle floored, but no fluid loss on the ground. I would look at all 4 corners. What m/c setup do you have? Firewall mounted, under floor mounted? Like previosly stated, fluid went somewhere. If firewall mounted and you have carpet, look under carpet.

Re: 1948 3600 brakes failed.
glenns towing #1349474 Tue Mar 10 2020 05:12 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
it is an under the floor MC, with no visable puddle


1948 3/4 ton Chevy Pickup
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