brakes are really hard to push after b303 cam install!

[91hatch337]

My brakes are really hard to push after the b303 cam install. I have a 91 5.0 built lower end b303 cam aod trans and my brakes are really hard to push. why?

 

[85ragtop]

I'll move this to 5.0 tech so people see it.

 

[monte87]

I would think maybe the cam has less vacuum on it, possibly. Not sure-Dont have a B cam.

 

[Shaolin Crane]

i know this seems like a smart ass comment but are you sure all the vacuum lines are hooked up?

 

[Deleted member 87397]

gotta be a vacuum issue with the change in cam or you missed a vacuum line somewhere. My money is on a vacuum line since the the brakes are super hard to push. A B cam would reduce your available brake vacuum some but not excessively.

 

[Foxfan88]

i think its vac line issue, the B-cam isnt going to reduce vacuum enough to cause brake problems, especially seeing how the time you will brake are under decel, if the trans is in gear, the RPMS are going to be up with a closed throttle and cause mroe vacuum. even if the trans is in nuetral, the VSS is going to be reporting the car is moving so the EEC will raise the RPM slightly until it comes to a complete stop. the raised RPMS with the closed throttle will also increase vacuum. so i would check for vac line problems.

 

[Mustang5L5]

B cam will operate the brakes. Issue needs to lie elsewhere

 

[Black1987Stang]

another vote for no manifold to the booster or a really bad vacuum leak

 

[tiptop]

missing hose somewhere

 

[thumper460]

IF it isnt the vacuum hose off... if you advance the camshaft 4* it will be right with the engine gods... and youwill live the adfd'l power...

Just me......

Thumper

 

[rsw007]

IF it isnt the vacuum hose off... if you advance the camshaft 4* it will be right with the engine gods... and youwill live the adfd'l power...

Just me......

Thumper

thumper how much higher than stock will a b303 with 1.7's advanced 4* pull? {rpms}
and do you think my 3000 stall converter will be enough?

 

[vadim]

damn, i read that last post wrong. duh. sorry for the usless post.


peace...Vadim.

 

[Maryland Stang]

Nope, not the cam. I have that cam set 4 degrees advanced (thanks for the tip Mike) and have zero braking issues.

 

[jrichker]

Check the vacuum hoses as suggested. Also check the rubber grommet that holds the vacuum check valve on the brake booster.
It is easy to find, the vacuum line from the vacuum tree connects to it.

A vacuum gauge would be helpful to see how much vacuum you actually have. The auto parts store may loan or rent one to you.
I would expect to see 12-14 inches of vacuum at 800 RPM even with a B cam.

 

[Strype]

Just had the same problem. Sure enough I forgot to connect the vacuum line from the upper manifold to the closest port (left most looking at it) on the vacuum tree.