Air over hydraulic brakes on Case MW24C

[ColdMike]

Hey all, I just picked up a front end loader, a 1984 CASE MW34C, renewed in 2009.

The brakes started smoking 20 minutes into my first drive (as I drove out of the mechanics shop that was supposed to get it in working order). The entire time the brakes were applied, no wonder I could only go 5mph .

I've learned quite a bit about the brake system in the past 24 hrs. The pedals seem to be appliying and releasing pressure just fine. I opened the bleeders at the calipers and fluid shot out so the brake fluid remained under pressure. Then the loader moved fine until I applied the brakes and the stuck again.

Trying to diagnose if it's in the air system or hydraulic system. Pressure is sticking on both front and rear brakes, is there a reason air pressure would remain in the line even if I hear the air release at the pedal?

My other best guess is that both master cylinders are sticking.

Can anyone teach me what I don't understand?

 

[NDT]

One reason that the brakes may not release is that the master cylinder piston is not fully returning to the resting position due to sticky brake pedal linkages. Peel back the boot and check.

 

[ColdMike]

One reason that the brakes may not release is that the master cylinder piston is not fully returning to the resting position due to sticky brake pedal linkages. Peel back the boot and check.

Are you saying that maybe the pedals (or what's beneath them) might not be returning all the way so some air pressure is still flowing to the air/hydraulic actuator?

 

[NDT]

Are you saying that maybe the pedals (or what's beneath them) might not be returning all the way so some air pressure is still flowing to the air/hydraulic actuator?

Yes that is one possibility that is the simplest to check.

 

[ColdMike]

Yes that is one possibility that is the simplest to check.

Thanks bud. I'll check and let you know. I suppose I could drain the air tank and see if I can push it in neutral to tell if it's air. And if it is air I'll start by digging around the pedals.

 

[Guyfang]

Do you have the TM's for this equipment?

 

[George P]

Hey all, I just picked up a front end loader, a 1984 CASE MW34C, renewed in 2009.

The brakes started smoking 20 minutes into my first drive (as I drove out of the mechanics shop that was supposed to get it in working order). The entire time the brakes were applied, no wonder I could only go 5mph .

I've learned quite a bit about the brake system in the past 24 hrs. The pedals seem to be appliying and releasing pressure just fine. I opened the bleeders at the calipers and fluid shot out so the brake fluid remained under pressure. Then the loader moved fine until I applied the brakes and the stuck again.

Trying to diagnose if it's in the air system or hydraulic system. Pressure is sticking on both front and rear brakes, is there a reason air pressure would remain in the line even if I hear the air release at the pedal?

My other best guess is that both master cylinders are sticking.

Can anyone teach me what I don't understand?

It's common for the pedals themselves to stick

 

[ColdMike]

It's common for the pedals themselves to stick

That's what it was. Thanks!