96 GM Motorhome Front Brakes Locked

You've already established this is a hydraulic problem. Start at the master cylinder and work your way toward the wheels. First loosen the fittings at the master cylinder to relieve the pressure. If this releases the pressure and the wheels turn, the problem is with the master cylinder

-- check the pushrod adustment, etc. and replace the master cylinder if necessary. If the pressure is still applied, then move down to the next point where you can loosen a fitting -- at the proportioning valve, or where a line joins a hose. The idea is to narrow down the area where the problem can be. Once the problem is narrowed to a specific item, then that item (such as a brake hose or master cylinder) can be checked and repaired or replaced as necessary.

With both of them locking up I would pull them and make sure they slide freely. This happen after setting all winter?

Hi, I did exactly what Hyundaitech suggested. I loosened up the front line on the Master Cylinder. Both wheels were still locked. I loosened up the line at the proportional valve (both sides) and the wheels were still locked. I loosened up the line before the rubber hose and the wheel was still locked. Finally, I loosened up the screw going through the rubber hose end into the caliper and the wheel turned all by itself (I had a braker bar through the studs to try and turn it, breaker bar weight made it turn all by itself.) My question now is, can both rubber hoses on both sides be BAD? The other front disc brake did the same exact thing. Thanks, Rick

Can both front rubber flex lines be bad? Yes. When I change one, I insist on changing them as a set.

RV owners tend to have more issues with items like rubber hoses then the average car driver does. This comes from the RV sitting in-active in the same storage space or parking area for one season.

Replace your flex lines. Possibly you should change the rear flex line from the frame to the rear end as well. Since it may start having the same problem soon. Charles

GM brake hoses have been known to collapse and not allow the fluid to return. I've not replaced what I would call many, but I know about the condition and I've done a few. Buy two new hoses, put them on, bleed the brakes, and all should be better.

Hi, I will change all 4 hoses. I am going to the Grand Canyon and I don't want any trouble on the road. Thanks, Rick Hill