Right Front wheel Locks Up

[Mark]

On the A2, the right front wheel locks up, I adjusted the wheels before, etc.I just got done driving it, locks up so it squeals.Pulls to the right pretty good.Stopped, checked brake fluid.But now it no longer locks up, squeals, etc.Makes me think the vent for the master cylinder is plugged up??The wheel will lock up again, based on the history.
Now there is a vent for the master cylinder? I thought the cap had one.The washer is there for the cap.I did look at the LF brake shoes.It being a single stage brake system all wheel brakes should work.Sometimes I do have to add a little brake fluid.
The only thing I haven't done is bleed the brakes.

[Horst]

If you have to add fluid on a regular basis, you must have a leak somewhere. Maybe on the other side on the front? Good thing on a 151 checking all the wheel cylinders is easy, just remove the wheels, pull the drums and check for leaks. First thing I would do. Check if all brake linings are clean and not soaked in fluid or grease.

The master cylinder has its vent in the cap. Either there is a small hole in the cap or a threaded opening which connects thru a pipe to the air filter in case you have a fording valve.

[m3a1]

If you are running the original soft lines, chances are good they are occluded and brake fluid is pushing past the blockage, but not returning which keeps that individual brake engaged. They do degrade and plug up.

Happily, it's an inexpensive repair.

[Mr. Recovery]

On the A2, the right front wheel locks up,
Now there is a vent for the master cylinder?

The Master cylinder is vented through the small hole in the cap.

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[Mark]

Ya, thanks for the feedback, I just thought of the rubber brake hose on the front wheels, which is what M3A1 is talking about.Probably 10 years ago I replaced them or did something with them.I'll check the hole in the cap, thanks for the info
Mr. Recovery, Horst.
I get rusty in this mechanic work, LOL.
Thanks you all again.
mark

[rickf]

The vent would not cause one wheel to lock up. Either the left wheel is not working and the right is trying to do all the work or the shoes could be contaminated with brake fluid. Or it could be a broken spring in the assembly. You need to pull both front drums and check them out very well. Brakes are something you need to be confident with working on and if not take it to a shop. It is your life and those of others on the road at stake.

[Mark]

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The pics are too small, I found the top round part of the shoe on the left side off the round peg, the bottom of the right shoe where the shoe ends, the pad tore off.The spring was riding on the star wheel. I always put a little wheel bearing grease on the backing plate where the shoe rubs.

[Horst]

Spring riding on the stars, that’s how it should be. Gives the clicks of the star and prevents it from turning.

[rickf]

Looks like one shoe is real thick and the other is real thin. When you are putting pictures up are you copying them directly from your computer? I am going to go on my Mac and see if there is an issue with putting pics up from a Mac.

[Horst]

No issues with a Mac. That’s what I’m using

[Mark]

I'll pull the drum again, yes the pics are coming directly from Mac laptop

[Mark]

The 1 brake shoe is 1/2", the other 3/8" The spring info I didn't, or if I did, I forgot which I do alot.
Thanks for the feedback

[m3a1]

Mark,

I'm running a Mac and whatever it is you're doing with posting your pictures, you're doing it wrong. I would be more than happy to talk you through it. Let's set up a time and you'll soon be posting pics. Check your PM for a message from me.

A pic is worth a thousand words and it's far easier for us to assist you if we can see what you are seeing.

Cheers,
TJ

[svramselaar]

hi

to check the brake hose
wen the wheel blocks open the bleed valve at the wheel if there come brake fluid and the wheel turns the hose is blockt

george

[Mark]

I straightened out the brake shoe, repositioned the springs, sprayed the brake shoe pads with brake cleaner.The wheel does not lock up any more.
It works ok now.