International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Thread Tools Search this Thread Display Modes
Old 04-28-2010, 07:55 AM
stumpjumper3's Avatar
stumpjumper3 stumpjumper3 is offline
Grease Monkey
Join Date: May 24, 2007
Location: Junction City Oregon
Posts: 466
Riddle me this (brake question)

I know that in order for powerboost brakes to work, my engine must supply adequate vacuum for maximum braking. Well after my cam install (K8600) my brakes suck when coming to a stop, but work fine if i've got some RPM's. Could this be that my camshaft has robbed me of some of my vacuum thats required for my brakes. How could i remedy this?

1978 Cherokee, 4 in and 33s

Reply With Quote
Old 04-28-2010, 10:17 AM
The Colonel's Avatar
The Colonel The Colonel is offline
FSJ Maniac
Join Date: Feb 21, 2010
Location: Chicagoland
Posts: 2,842
Do a search for Hydro-assist.

Before that I would check you entire vacuum system for leaks and be sure the check valve to the booster is holding vacuum.

Reply With Quote
Old 04-28-2010, 11:07 AM
Chris P.'s Avatar
Chris P. Chris P. is offline
Master Mechanic
Join Date: Oct 12, 2003
Location: Mt. Solon, Virginia
Posts: 1,307
How much vacuum are you getting at idle? I have the 8600 and don't have any brake problems.
79 J10 Honcho 360/T-18/D20
Summit 8600 cam, GM TBI
78 Wagoneer 360/TH400/QT

Reply With Quote
Old 04-28-2010, 11:12 AM
87Gray's Avatar
87Gray 87Gray is offline
New Member
Join Date: Apr 19, 2010
Location: New Jersey
Posts: 10
Is the idle speed high enough? More rpms mean lower vacuum, but too low rpms can do the same thing.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
D60 Rear Disk Brake rotor question. J20FarmTruck General FSJ Tech 2 05-15-2007 02:45 PM
Brake Drum Brand Question utvolsfan General FSJ Tech 3 11-28-2006 12:09 PM
YEEHAW! IT LIVES! And a brake question rampagefsj Off-Road FSJ Tech 8 03-26-2006 09:55 AM
Brake light question... illegalFSJ General FSJ Tech 3 11-06-2003 06:18 PM
'69 wagoneer brake sensor question Slingshot formally slingluff General FSJ Tech 8 03-14-2003 12:48 PM

All times are GMT -6. The time now is 07:34 PM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
corner corner