Hard pedal intermittantly when braking - Ferrari Life
 
LinkBack Thread Tools Display Modes
post #1 of 8 Old 05-13-2011, 03:30 PM Thread Starter
Owner
 
Levi Palmer's Avatar
 
Join Date: Aug 2008
Location: Chico, Ca
Ferrari Life Posts: 31
Garage
Hard pedal intermittantly when braking

For some reason I get a "hard" brake pedal from time to time... usually under conditions when I'm driving more aggresively... It never really happens under normal driving conditions. Brake booster was checked for vacuum and was good... I had brakes done thinking that the pads were glazed... but still happens time to time...any ideas? Thanks!
Levi Palmer is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 05-14-2011, 12:51 PM
Owner
 
Gcalo's Avatar
 
Join Date: Feb 2006
Location: San Ramon, Calif
Ferrari Life Posts: 3,627
Your brake fluid has passed its prime.

Fully bleed the brakes, use Pentosin Super Dot 4, and make sure to then bleed the two tits on the master cylinder.

Make sure to suck out existing brake fluid in M/C first, put in new fluid, and then start to bleed. Keep adding to M/C as you bleed each caliper.
Gcalo is offline  
post #3 of 8 Old 05-14-2011, 07:05 PM
Owner
 
mk e's Avatar
 
Join Date: Jun 2010
Location: PA, USA
Ferrari Life Posts: 4,439
I would say the vacuum check valve is suspect and I'd probobly just replace it, they're cheap.
mk e is offline  
 
post #4 of 8 Old 05-16-2011, 08:44 PM
Owner
 
KKRace's Avatar
 
Join Date: Nov 2009
Location: Near Olney, MD
Ferrari Life Posts: 1,354
I could be driving technique as well since you mentioned it only happens while aggressive driving. If you pump the brake a couple times while on the gas you could use up all the vacuum until you get off the gas for a second. If you are getting happy heal and toeing on the gas pedal while braking you could have a problem.

Very common cause of accidents with old ladys that "two foot". No power brakes when they need them the most.

Remember you only have vacuum when you don't have your foot on the gas.

------------------------------

Life is Good!
KKRace is offline  
post #5 of 8 Old 05-17-2011, 09:34 AM
Owner
 
mk e's Avatar
 
Join Date: Jun 2010
Location: PA, USA
Ferrari Life Posts: 4,439
Quote:
Originally Posted by KKRace View Post
I could be driving technique as well since you mentioned it only happens while aggressive driving. If you pump the brake a couple times while on the gas you could use up all the vacuum until you get off the gas for a second. If you are getting happy heal and toeing on the gas pedal while braking you could have a problem.

Very common cause of accidents with old ladys that "two foot". No power brakes when they need them the most.

Remember you only have vacuum when you don't have your foot on the gas.
I knew there was a reason I didn't like power brakes beside the extra weight, they are dangerously unsafe...
mk e is offline  
post #6 of 8 Old 06-17-2011, 02:35 PM Thread Starter
Owner
 
Levi Palmer's Avatar
 
Join Date: Aug 2008
Location: Chico, Ca
Ferrari Life Posts: 31
Garage
So... Ferrari of SF drained all fluid to no avail. Next they changed check valves... still nothing... ordered new brake booster and master.... it's being put in today... I hope it's not the ABS unit... ugh
Levi Palmer is offline  
post #7 of 8 Old 06-22-2011, 10:24 AM Thread Starter
Owner
 
Levi Palmer's Avatar
 
Join Date: Aug 2008
Location: Chico, Ca
Ferrari Life Posts: 31
Garage
Booster was bad. Brakes are fantastic again!
Levi Palmer is offline  
post #8 of 8 Old 06-22-2011, 10:27 AM
Owner
 
Gcalo's Avatar
 
Join Date: Feb 2006
Location: San Ramon, Calif
Ferrari Life Posts: 3,627
Glad to hear your brakes got a boost!!!
Gcalo is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
Copyright 2012 ONE Media, Inc.
FerrariLife is independently run with no affiliation with Ferrari SpA
Ferrari for Sale | Maserati for Sale