all gaskets are good, vacuums are good, egr is working properly and dealership issued, map sensor is new, tps, iac, temp sensor, fuel injectors, and plugs are all new.

so my question is, can a brake booster check valve be at fault if it were leaking?

the brake light comes on after going 35mph and stays on until i shut it off, and my brakes do feel kind of spongy but builds up if i pump it once. ive recently replaced the brakes on all 4, including wheel cylinders, calipers and master cylinder, and bled them properly, about 3 times.

it has never stalled, runs strong at about 1500rpm but bogs on the freeway in overdrive at like 50 and until 70. also throws a code 32 and 34 after ive driven about 20 miles.

thanks in advance

 

The spongy brakes sounds like a brake booster fault.
Brake booster check valve leaking?

Code 34
MAF Sensor (ECM Code 34) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Code 32
The Lowdown on Code 32 (EGR) - ThirdGen.org

 

my truck doesnt have maf. that would be map, and it has been replaced. no leaks in the manifold either..

 

all codes are gone. it was a leaking map sensor right out of the box. but still wants to flood.