Tried to bleed trailer brakes. Epic fail.

Joined
May 4, 2003
Messages
6,614
Location
southeast US
I guess forgot to do it sooner. Very overdue after 11 years. The fluid was unspeakably dirty, but brakes worked fine. I cleaned the reservoir as much as I could. I never knew fluid can turn to mud. Replaced with fresh fluid and used my spunky new vacuum bleeder. The bleeder screws (brass) were tiny (I didn't have small wrench enough, 7mm was too big) and I had hard time putting universal wrench and hose on them at the same time. I thought it was a bit unusual the screws were at the bottom of calipers too. I managed to get the fluid relatively clean (but never totally clean) at the bleeding screws, but it was going very slow. I replaced the wheels and did brake test and nothing. I guess the bleeding screws should not be at the bottoms after all. Looks like I have a project for next weekend too. Now, a question. Are bleeding screws interchangeable? I'm tempted to put some bigger ones in.
 
Joined
May 12, 2009
Messages
5,532
Location
Canada
"I thought it was a bit unusual the screws were at the bottom of calipers too. " That sounds very wrong. Could they have been put each caliper on the wrong side and Upside down?
 

CT8

Joined
Oct 9, 2014
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15,387
Location
Idaho
Due to its age you may have run the piston in the master cyl into the accumulates sludge and wiped out the M/C. Sometimes the seemingly simple jobs turn to crud.
 
Joined
Aug 30, 2004
Messages
25,161
Location
CA
Originally Posted By: expat
"I thought it was a bit unusual the screws were at the bottom of calipers too. " That sounds very wrong. Could they have been put each caliper on the wrong side and Upside down?
+1
 
Joined
Apr 23, 2012
Messages
1,462
Location
East Mountains, NM
Originally Posted By: The Critic
Originally Posted By: expat
"I thought it was a bit unusual the screws were at the bottom of calipers too. " That sounds very wrong. Could they have been put each caliper on the wrong side and Upside down?
+1
Agreed. But it might be necessary to remove the calipers, and bleed them while inverted. Or, bleed them from the caliper to the master, with a pressure bleeder. (I have had to do both, with unusual systems.)
 
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