I'll give it a go...
Two pumps to make front brakes work??
- Thread starter amaurer
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I'm not quite sure what is going on with my left rear brake. But if I adjust it per the above I get a squeek so I have to back it off a couple of clicks.
I just read this thread with great anticipation of an answer to my similar issue. I feel your pain.... or should I say I feel your lack of pressure! Please post if you find a solution. I am beginning to wonder if my aftermarket parts are not compatible with each other.
The only way I could get my brakes to bleed fully was to pre-fill the wheel cylinders before fitting them, there is a pocket of air above the bleeding hole that will never come out with normal bleeding. I have done it by letting the top piston come out with the cylinder fitted and easing it back in when it's full of fluid but it's messy and you run the risk of damaging the seal with old cylinders.
I had no luck with a Mity-Vac. So I rigged up two hoses into the jar. I would pump and then put a stick between the seat and pedal to hold it. Crack the fittings and then slowly pump the pedal a few times and put the stick back in place. Refill reservoir and repeat. I can tell you that I ran seven quarts of brake fluid through the system and if I started over, I would still get bubbles. So I think "diogenese" is onto something here. I have never had such problems with so many cars, motorcycles, etc. as I have had with this system. No wonder people spend big bucks to convert these things into something else keeping the body and that is about all!
Nope, still the same. I just bought this FJ and it was sitting for 4 years. Brakes have been flushed with new DOT3 brake fluid and front drums have been adjusted until they just rub. Shoes are 60%+. Whole front brake system looks surprisingly clean and in good shape.
If the PO removed the residual valve from the front lines at the master cylinder, would that cause the lack of a firm pedal until the 2nd pump?
The 2nd pump brings strong braking to all 4 tires and will lock them all up on pavement. A strong 1st pump will only lock up the rears.
If the PO removed the residual valve from the front lines at the master cylinder, would that cause the lack of a firm pedal until the 2nd pump?
The 2nd pump brings strong braking to all 4 tires and will lock them all up on pavement. A strong 1st pump will only lock up the rears.
I burped my rear cylinders like diogenese suggests. I was by myself, so I haven't rebled the system after I opened them. I may have gotten a little air out, but it was hard to tell. Did you happen to read this thread?
Still no brakes!
Still no brakes!
yes, read and re-read...
I think the master cylinder isn't moving enough fluid and that is why it takes two pumps. One to get the shoes moving and one to get them stopping.
If the Previous Owner removed the residual valve from the front lines at the master cylinder, would that cause the lack of a firm pedal until the 2nd pump?
The 2nd pump brings strong braking to all 4 tires and will lock them all up on pavement. A strong 1st pump will only lock up the rears.
The 2nd pump brings strong braking to all 4 tires and will lock them all up on pavement. A strong 1st pump will only lock up the rears.
On my '70 it had the single reservoir master cylinder and so no proportioning valve. It required the two pump routine regardless of adjustments and bleeding. Sucked.
Just thought I would add some of my findings from the last two nights.
I bought all new brake components. New calipers, wheel cylinders and brake master cylinder. The master is stamped 7/8. Rear cylinders look similar to the stock ones and seem to be set up the same way. I had a soft pedal after several bleeds and adjustments. After reading a lot, I removed the drums checked my brakes and burped the rear cylinders as described in a few other threads. Rebled the brakes, adjusted the rear pretty tight and I finally have pretty good brakes. I ordered a new brake booster as I feel everything else on my rig was worn out and this may be the icing on the cake for the brakes. Fingers crossed.
I think the "burping" of the rear cylinders got a pocket of air out that would not come out with normal bleeding.
I bought all new brake components. New calipers, wheel cylinders and brake master cylinder. The master is stamped 7/8. Rear cylinders look similar to the stock ones and seem to be set up the same way. I had a soft pedal after several bleeds and adjustments. After reading a lot, I removed the drums checked my brakes and burped the rear cylinders as described in a few other threads. Rebled the brakes, adjusted the rear pretty tight and I finally have pretty good brakes. I ordered a new brake booster as I feel everything else on my rig was worn out and this may be the icing on the cake for the brakes. Fingers crossed.
I think the "burping" of the rear cylinders got a pocket of air out that would not come out with normal bleeding.
Problem Solved...went to adjust the rear drums and when I took off both drums one wheel cylinder was adjusted way out and the other one wasn't adjusted at all...evened them out until I could just slip on the drum, then adjusted both evenly until the wheel wouldn't spin, finally I backed off each adjuster evenly until the wheel spun with just a little drag.
Nice strong brakes on the first pump.
This is the 3rd 40 I've owned, but the first with drums all around. It's been parked by the PO since 2012 and I'm thinking this is the reason he parked it and eventually sold it to me for a good price. Mint interior, fiberglass tub and fenders, winch, good mud tires. I'm thinking this will be mine for a long while
Thank you very much to those who took the time to reply to this post. I greatly appreciate the accumulated knowledge on this site.
Rick
Nice strong brakes on the first pump.
This is the 3rd 40 I've owned, but the first with drums all around. It's been parked by the PO since 2012 and I'm thinking this is the reason he parked it and eventually sold it to me for a good price. Mint interior, fiberglass tub and fenders, winch, good mud tires. I'm thinking this will be mine for a long while
Thank you very much to those who took the time to reply to this post. I greatly appreciate the accumulated knowledge on this site.
Rick
