brakes are really hard to push after b303 cam install!

9

91hatch337

New Member

Nov 3, 2008

1

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Locust Grove Va.

Nov 3, 2008

#1

• Nov 3, 2008

• #1

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

BTW, I like dudes.

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Nov 29, 1999

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NC

Nov 7, 2008

#2

• Nov 7, 2008

• #2

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

 

monte87

Founding Member

Feb 26, 2001

876

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new york

Nov 7, 2008

#3

• Nov 7, 2008

• #3

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

 

Shaolin Crane

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Oct 6, 2008

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Kommiefornia

Nov 7, 2008

#4

• Nov 7, 2008

• #4

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

 

Reactions: 88LX5.Oh

D

Deleted member 87397

Nov 7, 2008

#5

• Nov 7, 2008

• #5

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

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Nov 7, 2008

#6

• Nov 7, 2008

• #6

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

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,260

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Massachusetts

Nov 7, 2008

#7

• Nov 7, 2008

• #7

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

 

Black1987Stang

Active Member

Aug 22, 2004

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Jersey Shore

Nov 8, 2008

#8

• Nov 8, 2008

• #8

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

 

T

tiptop

New Member

Apr 6, 2008

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Nov 8, 2008

#9

• Nov 8, 2008

• #9

missing hose somewhere

 

thumper460

Founding Member

Jul 24, 2000

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Orange Park , Fl

Nov 8, 2008

#10

• Nov 8, 2008

• #10

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

New Member

Jul 7, 2004

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Lexington,SC

Jan 12, 2009

#11

• Jan 12, 2009

• #11

thumper460 said:

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

Click to expand...

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?

 

V

vadim

New Member

Nov 29, 2008

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Jan 12, 2009

#12

• Jan 12, 2009

• #12

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


peace...Vadim.

 

Maryland Stang

Active Member

Aug 21, 2002

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Greenville, NC

Jan 13, 2009

#13

• Jan 13, 2009

• #13

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

 

jrichker

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Mar 10, 2000

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Dublin GA

Jan 13, 2009

#14

• Jan 13, 2009

• #14

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

Cuthbert catcher

Founding Member

May 11, 1999

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Huntsvegas, AL

Nov 5, 2012

#15

• Nov 5, 2012

• #15

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.