Braking issues

[lilkiduno]

Okay guys. I do not know where to start. I just got my truck back from the transmission shop. Now my brakes are extremely hard. I have been doing some reading and it appears as if though its an issue with the brake booster. But what are the steps I need to take to test the booster? After the trip to the trans shop I have absolutely no money until Friday so I am really hoping its not an expensive fix.

I have read it could be the check valve in the manifold to booster line, the brake booster itself. It isn't loosing pressure at stop lights it just takes a whole lot of leg pressure to apply any pressure. Is the transmission taking too much vacuum?

Vehicle:
1976 K5 Blazer
350/350/np203

[bd]

Check the 11/32" vacuum hose between the booster and intake manifold fitting.  Make sure the hose is properly connected and not pinched.  If the hose connections appear okay, pull the check valve out of the booster with the engine running, trans in park, and park brake set to see if vacuum is reaching the booster.

[lilkiduno]

Wow. I feel like a huge donkey. The vacuum hose was unplugged right before the check valve. Here I was  telling myself I had to spend the $100 on a new brake booster and master cylinder.

[bd]

The simple solutions are always a relief!

[lilkiduno]

I was so happy, the drive home from work was such a relief.

[75_chevy]

hello I am also needing to apply a lot of pressure to the pedal to get my brakes to work can you please show a pic of the check valve? I'm not sure what it is  my vacuum runs straight from the manifold to the booster


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[Irish_Alley]

the check valve is the white plastic thing on the brake booster and you will have a vacuum line attached to it from the intake/carb area