Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  We salute a legendary member of the community.
Thank you for selflessly sharing your wisdom with us...
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 924/944/968 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Dane Brown's Avatar
 
Join Date: Jun 2012
Location: Federal Way, Washington
Posts: 170
why the faster i go that harder my brakes are you push?

So today i was going a little bit of a lot over the speed limit and when i pushed on the brakes they where really reallllly hard to push in, and it took really long to get the car to slow down. I had to down shift to slow down because cars where coming up quick. Driving in the city or just driving normal they work great, nothing wrong with them. Anything over 85 or 90 slowing down feels like i have no power brakes along with no brake pads.
Old 07-02-2012, 09:06 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
Registered User
 
1982_928's Avatar
 
Join Date: Jun 2011
Location: Texas
Posts: 322
Garage
Bad brake booster probably
__________________
'82 928, auto. '83 928s, auto. '65 El Camino, 350, power glide. '84 Dodge W150 Marksman edition, 273, auto. '74 260z, 4 speed.
Old 07-02-2012, 10:12 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Toofah King Bad
 
Rasta Monsta's Avatar
 
Join Date: Oct 2006
Location: International Conference of Sports Car Clubs
Posts: 3,120
Garage
+1 on the booster, or crappy/glazed pads?
__________________
» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 07-03-2012, 06:32 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
1988 944 2.5L 8-v NA 271k
 
VirginiaF1's Avatar
 
Join Date: May 2011
Location: Richmond, vA
Posts: 448
Garage
Porsche Crest

Quote:
Originally Posted by Rasta Monsta View Post
+1 on the booster, or crappy/glazed pads?
Are glazed pads recoverable in any way?
Or are new pads ( and proper break-in ) the only solution?

If a non-leaking booster passes the "ignition off - push pedal - pedal hardens - start ignition - pedal recovers test" how else to determine booster's imminent failure?

Thanks as always
__________________
'88 8v n/a 271k with 41k on current TBelt
M454 M533 M650 M425 M418
New Feb'13 Bridgestone Grid 019.. awesome.
Paid just $1,700 running & inspected.
Big RUSH Fan! Lic Plate = LIFESON
Old 07-03-2012, 06:52 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
Toofah King Bad
 
Rasta Monsta's Avatar
 
Join Date: Oct 2006
Location: International Conference of Sports Car Clubs
Posts: 3,120
Garage
http://www.autoshop101.com/forms/brake05.pdf
__________________
» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 07-03-2012, 07:11 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
944 addict
 
mytrplseven's Avatar
 
Join Date: Sep 2010
Location: florida
Posts: 1,278
Garage
Send a message via AIM to mytrplseven
Pads are cheap. Easy to replace. Do them first and see if the problem goes away. If it doesn't, look at the booster and the vacuum lines going to it. Get a power bleeder and flush out the brake fluid. Start with the blue stuff and next year, do it again with the gold stuff. Yearly service of the fluids is a good practice and with the power bleeder you can do it in less than a 1.2 hour.
__________________
3 944's, 2 Boxsters and one Caman S. Really miss the Cayman.
Old 07-03-2012, 07:54 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
Custom User Title
 
mikepellegrini's Avatar
 
Join Date: Sep 2007
Location: Tacoma, WA
Posts: 1,745
Garage
I had the same problem in my 951 and replaced the booster (which is a real, flamin' SOB), only to find the problem persisted.

The culprit ended up being the venturi. I did a venturi delete, running the brake booster vacuum directly from the manifold and voila, I've got excellent brakes.

The moral of the story is to check your vacuum lines before spending multiple hours upsidedown under the dash...
__________________
83 944 NA - Black on black
86 951 - Red
97 Ford Expedition

He who hesitates is lost.
Old 07-03-2012, 05:51 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Ornery Bastard
 
Join Date: Sep 2001
Location: Bellevue, WA
Posts: 2,777
The problem sounds much more like a check valve failure than a vacuum booster failure. Check the lines to the booster first (NA cars don't have the venturis like the turbos do, so it's not possible for your problem to be the venturis), especially any one-way valves designed to "trap" vacuum in the booster.

Also, obligatory "what the hell are you doing at 85-90 around Federal Way, WA where the max speed limit is 60?" comment.
__________________
Shifting is an art. Learn it, love it, live it.
---------
Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
Old 07-04-2012, 08:25 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
Dane Brown's Avatar
 
Join Date: Jun 2012
Location: Federal Way, Washington
Posts: 170
Thanks for all the tipsguys. I wrote them all down no gonna see if i can go fix it.

High way 167 was pretty much empty on my way back from school in south hill, i saw a huge gap and i thought i might get a little tast of what she can do. I know i know not the smartest thing to do.
Old 07-04-2012, 08:40 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Toofah King Bad
 
Rasta Monsta's Avatar
 
Join Date: Oct 2006
Location: International Conference of Sports Car Clubs
Posts: 3,120
Garage
Top speed test with dodgy brakes?

:|
__________________
» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 07-04-2012, 05:00 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #10 (permalink)
Registered User
 
Dane Brown's Avatar
 
Join Date: Jun 2012
Location: Federal Way, Washington
Posts: 170
no not top speed just a little fast
Old 07-04-2012, 10:14 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #11 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 02:37 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.