Vaccum Pump Pressure? - Page 2 - Ford Truck Enthusiasts Forums



1994.5 - 1997 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by:

Vaccum Pump Pressure?

Reply
 
 
 
Thread Tools Search this Thread
  #16  
Old 01-22-2010, 07:38 AM
Cuda_jim's Avatar
Cuda_jim Cuda_jim is offline
Post Fiend
 
Join Date: Oct 2003
Location: MICHIGAN
Posts: 5,903
Cuda_jim has a great reputation on FTE.Cuda_jim has a great reputation on FTE.Cuda_jim has a great reputation on FTE.Cuda_jim has a great reputation on FTE.Cuda_jim has a great reputation on FTE.
Quote:
Originally Posted by 91dirtydiesel View Post
id take my brakes being soft all day compared to having to pull the brake pedal back up with my foot like i do. any one know how to fix that?
My guess is the master cylinder.......the return spring is broke or it's just hanging-up internally. Take a look for binding in the pedal pivot too.
Reply With Quote
  #17  
Old 01-22-2010, 04:39 PM
tjbeggs's Avatar
tjbeggs tjbeggs is offline
Post Fiend
 
Join Date: Apr 2004
Location: Silver Lake Dunes, MI
Posts: 12,834
tjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to all
18 in hg vacuum or more more is spec for the vauum pump. If you have a low pedal then vacuum is NOT your problem. Your rear brakes could be out of adjustment, ABS valve is bad, Master cylinder is bad, or you have a leak. Most common cause is rear brakes out of adjustment. For a test use a pair of vise grips a adjust them so they just clamp the rear brake hose off then hit your brakes. If its still soft then get two more sets of vise grips and clamp the front hose too. If its still soft then you either have a Master cylinder or ABS valve issue.
Reply With Quote
  #18  
Old 01-22-2010, 05:28 PM
wheelie31's Avatar
wheelie31 wheelie31 is offline
Senior User
 
Join Date: Jan 2005
Location: pennsburg Pa
Posts: 222
wheelie31 is starting off with a positive reputation.
is there a way to just test the ABS actuator? since the brakes are fine and the master cylinder is withen 1 year old.
Reply With Quote
  #19  
Old 01-22-2010, 05:39 PM
Action4478 Action4478 is offline
 
Join Date: Aug 2006
Posts: 10,450
Action4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputation
Quote:
Originally Posted by wheelie31 View Post
my brakes work there just squishy and pedel goes done pretty far, I bleed them a couple times, I have worst luck with the brake system i put all new lines on new brake cylinders brake booster and master cylinder all at once last year, and still have problems,
You still have air in the system .. maybe bench bleed the master cyl first
Reply With Quote
  #20  
Old 01-22-2010, 05:40 PM
Action4478 Action4478 is offline
 
Join Date: Aug 2006
Posts: 10,450
Action4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputationAction4478 has a superb reputation
Quote:
Originally Posted by 91dirtydiesel View Post
I have bad luck with brakes too. My current problem is that my pedal wont return without me pulling it back up with my foot. I hate brakes lol
You need a new master cylinder ....
Reply With Quote
  #21  
Old 01-22-2010, 06:01 PM
paddler paddler is offline
Senior User
 
Join Date: Dec 2002
Location: Columbia, MD
Posts: 261
paddler is starting off with a positive reputation.
Bad Vacuum = HARD brakes

If the vacuum system is bad, you get no power assist, and have to push the hydraulic fluid with only your strength. Good hydraulics and bad vacuum will feel VERY hard and pedal will move very little. Do a double-leg-press on the pedal to get stopped (eventually), but you won't bottom out the pedal.

Really soft pedal suggests good vacuum (pump, lines, booster) but squishy hydraulics.

Sounds like your problem isn't vacuum.
Reply With Quote
  #22  
Old 01-22-2010, 10:33 PM
tjbeggs's Avatar
tjbeggs tjbeggs is offline
Post Fiend
 
Join Date: Apr 2004
Location: Silver Lake Dunes, MI
Posts: 12,834
tjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to alltjbeggs is a name known to all
Quote:
Originally Posted by wheelie31 View Post
is there a way to just test the ABS actuator? since the brakes are fine and the master cylinder is withen 1 year old.
Have you adjusted the rear brakes up correctly? Take my advice by clamping brake lines and report back. It is testing and will keep you from spending money that won't fix your problem. Trust me I have been down this road about 100 times....2 times this week.
Reply With Quote
  #23  
Old 09-29-2013, 10:44 PM
Michael96 Michael96 is offline
New User
 
Join Date: Sep 2013
Posts: 10
Michael96 is starting off with a positive reputation.
Is that inches of mercury?
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Missing Vaccum diagram stinger57 Nevada Chapter 1 12-20-2016 08:26 AM
2008 E350 6.0L Sat13579 6.0L Power Stroke Diesel 1 08-02-2016 09:11 PM
4.9L ported vaccume not working F100XL300I6 New Member Introductions 3 04-26-2014 07:53 AM
Fuel pump blowing not sucking! Buyerz 1973 - 1979 F-100 & Larger F-Series Trucks 11 03-23-2014 10:57 AM
Vacuum / brake system problem smuzz 1999 to 2016 Super Duty 9 04-06-2010 06:53 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1991, 450, 73, 73l, 95, 97, booster, brake, check, f350, ford, idi, pump, purpose, replace, testing, vacuum

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 03:10 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: