How do you test a brake booster?

[WarBeard]

OK so I did the tests suggested, Booster seems ok So I went to Auto zone to buy a new master and the old guy in there asked to see the truck and I said sure!
So we went outside and he had me pop the hood He checked the master and the fluid level then he went inside and pushed on the brake. He says to me "Before you spend any money here I would check the adjustment of the rear shoes" He says that they may be way out of adjustment causing the pedal to go down so far. He says I should also Bleed the brakes till you see new fluid come out of the bleeder.

I have never been talked out of buying something at a parts store LOL That's a new one for me so I think I will do what he said first and see what results I get.

WHAT DO YOU GUYS THINK OF THIS GUY'S IDEAS?

[Christopher J]

Any luck with this? I'm having a similar problem on my '72 Suburban.

Mechanic just replaced the whole brake booster and master cylinder from a new kit I bought from The Truck & Car shop in Orange, CA and the same problem described above persists that was happening before the booster and master were replaced with a new kit.

I wondering if it was the rear shoes being way out of adjustment, as the AutoZone rep stated.

My mechanic is about to pull the brake cylinder and booster kit so I can drive an hour back down to Orange to try and replace it.

Originally Posted by motomech

OK so I did the tests suggested, Booster seems ok So I went to Auto zone to buy a new master and the old guy in there asked to see the truck and I said sure!
So we went outside and he had me pop the hood He checked the master and the fluid level then he went inside and pushed on the brake. He says to me "Before you spend any money here I would check the adjustment of the rear shoes" He says that they may be way out of adjustment causing the pedal to go down so far. He says I should also Bleed the brakes till you see new fluid come out of the bleeder.

I have never been talked out of buying something at a parts store LOL That's a new one for me so I think I will do what he said first and see what results I get.

WHAT DO YOU GUYS THINK OF THIS GUY'S IDEAS?