Default brakes.....hope its in the right forum 

Old 06-27-2011, 04:40 PM   #1
tphin is offline
tphin
New Jeeper
 
Join Date: Oct 2010
Location: maine
Age: 50
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0 tphin is on a distinguished road
have an 83 cj7,all of a sudden the brakes are acting funny.when i initially hit the brakes the pedal is fine but within a few seconds starts to get soft and will eventually go to the floor.its not leaking fluid any where i can see,im stumped

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote


Register for a free membership and remove this add!
Vote for Jeep-CJ.com daily!
Vote for Jeep-CJ.com

Default Re: brakes.....hope its in the right forum 

Old 06-27-2011, 06:18 PM   #2
IOPort51 is offline
IOPort51
NOT the voice of reason
Jeep-CJ.com Moderator
Vehicle(s): 1977 cj-5 4.2 W/MC2100 carb, 4.0 head W/3 angle valves,SS Header,TFI ignition with MSB-6 offroad module,CS144 140 amp RPS alternator with remote regulator T-150,d-20,Dana 44 with OX lock and disk brakes. D-30 with Spartin locker, skyjacker 2.5 lift?nitro shocks,31" BFG A/T off road.8000 lb Warn winch, original owner.=^) 2006 Toyota Tacoma
 
IOPort51's Avatar
 
Join Date: Oct 2009
Location: Garland Texas
Age: 66
Posts: 7,652
Images: 424
Thanks: 126
Thanked 634 Times in 543 Posts
Rep Power: 18 IOPort51 is on a distinguished road
is the resivoir level dropping?? I would suspect the master cylinder.


Quote:
Originally Posted by tphin View Post
have an 83 cj7,all of a sudden the brakes are acting funny.when i initially hit the brakes the pedal is fine but within a few seconds starts to get soft and will eventually go to the floor.its not leaking fluid any where i can see,im stumped
__________________
My friends call me IO, I hope you will too.
We remember the times, when the voice in our head was screaming like a little girl.

you asked for opinions, this one is mine.

That which does not kill us, makes us stronger.

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-27-2011, 07:01 PM   #3
Old Dog is offline
Old Dog
Need a Life Jeeper
Vehicle(s): 83 CJ7 350 tbi, TH350, D300 twin sticked & clocked, narrowed Chief D44 Eaton Elocker & Moser shafts, Explorer 8.8 Detroit locker, 410's, RE 4.5" spring lift 1" body lift, 35" Claws, cage tied to frame, Corbeau baja seats, HD tie rod and draglink, u-bolts flipped, custom skid plate and sliders, Warn 9.5ti winch with Amsteel synthetic line
 
Old Dog's Avatar
 
Join Date: Mar 2009
Location: Stonelick Lake, Ohio
Age: 67
Posts: 7,216
Images: 82
Thanks: 219
Thanked 754 Times in 625 Posts
Rep Power: 18 Old Dog is on a distinguished road
I agree with IO

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-28-2011, 06:08 AM   #4
tphin is offline
tphin
New Jeeper
 
Join Date: Oct 2010
Location: maine
Age: 50
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0 tphin is on a distinguished road
Quote:
Originally Posted by IOPort51 View Post
is the resivoir level dropping?? I would suspect the master cylinder.
No it has not dropped

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-28-2011, 03:53 PM   #5
reckless is offline
reckless
New Jeeper
Vehicle(s): !977 Cj5 , 2B 3000cc , Diesel
 
Join Date: May 2011
Location: pakistan
Posts: 34
Images: 32
Thanks: 14
Thanked 0 Times in 0 Posts
Rep Power: 0 reckless is on a distinguished road
I have the similar problem..At 1st press padle is very soft and works good but eventually it gradually hits the dead end . But at the same time it is very sensitive.
1) check the master cylinder and caliper cylinder ratio.
2) check the rubber pipe attached to brake lines it might be to old.
3) valves ratio .
4) it might be the gap btw wheel drums and the brake pads . try to adjust them or change the drum if necessary.
5) The route of brake lines . if they are passing thru the are which gets hot like exaust pipe , it might be heating up brake fluid.

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-28-2011, 08:25 PM   #6
BusaDave9 is offline
BusaDave9
Jeep-CJ.com Admin
Vehicle(s): 1979 Jeep CJ5 with 304 V8, T18 Transmission, Dana 20 Transfer case with TeraLow 3:1 gears, 4.88 axle gears, Detroit Locker up front and Ox Locker in back with 1 piece axle shafts, 36" SuperSwamper SX Tires, Shackle reversal, MileMarker Hydraulic winch, MSD 6A ignition.
 
BusaDave9's Avatar
 
Join Date: Jan 2010
Location: Durango, Crawlarado
Age: 58
Posts: 4,400
Images: 353
Thanks: 511
Thanked 1,698 Times in 910 Posts
Rep Power: 10 BusaDave9 will become famous soon enough
Listen to IOPort and OldDog. A couple of the more experienced jeepers on this site.
It's a problem with the hydraulics not the mechanics of the brakes.
It's the master cylinder.
__________________
Busa

Click here to see my '79 CJ5

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-30-2011, 06:38 PM   #7
dpuck is offline
dpuck
New Jeeper
Vehicle(s): 78 CJ7, stock 304 with Eldabrock 600 4 bbl. carb., Dana 30 front, T150 Trans, Dana 20 TC and rear axle, Warn 8000 winch. Original paint, running 31's on original spoked wheels. 2 1/2" lift springs with 1/2" lift heavy duty shackles.
 
Join Date: May 2011
Location: Saint Augustine, Fl
Age: 67
Posts: 45
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 0 dpuck is on a distinguished road
Quote:
Originally Posted by BusaDave9 View Post
Listen to IOPort and OldDog. A couple of the more experienced jeepers on this site.
It's a problem with the hydraulics not the mechanics of the brakes.
It's the master cylinder.
Yep, I've seen it a hundred times when I worked in the garage.

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 06-30-2011, 09:45 PM   #8
73CJ is offline
73CJ
Full Time Jeeper
Vehicle(s): 73 CJ5 4.0 head on a 258, HEI, Holley Projection w/ 4.56, Detroit lockers Narrowed D44 front and full float D44 rear T14 w/ D20 4 wheel discs, 38.5 Boggers
 
73CJ's Avatar
 
Join Date: Feb 2009
Location: Detroit Lakes, MN
Posts: 1,948
Images: 61
Thanks: 80
Thanked 202 Times in 187 Posts
Rep Power: 13 73CJ is on a distinguished road
Internal leakage of the master cylinder. Check for pits in the piston bore. Brake fluid likes to absorb moisture and pit the bore. I switched to silicon fluid and end of failing master cylinder.

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote

Default Re: brakes.....hope its in the right forum 

Old 07-01-2011, 10:22 AM   #9
JR74CJ5 is offline
JR74CJ5
Missing-Presumed Wheeling
Lifetime Supporter

Vehicle(s): 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ OME 2-1/2" Lift Spring Conversion
 
JR74CJ5's Avatar
 
Join Date: Jan 2011
Location: Elk Grove, CA
Age: 35
Posts: 2,994
Images: 80
Thanks: 1,976
Thanked 675 Times in 465 Posts
Rep Power: 12 JR74CJ5 is on a distinguished road
We just replaced the Master Cylinder last night on my Uncles CJ.

Same problem, and fixed the solution...



~ JR
__________________

JR - ECV3
My Build< Click me

 

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!Stumble this Post!
Reply With Quote
Reply

Bookmarks

Tags
brakes.....hope , forum


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
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

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Manual Brakes to Power Brakes grunt Misc CJ Discussion 26 05-19-2013 11:07 PM
cj7 brakes paparooster Misc CJ Discussion 14 06-24-2012 03:01 PM
hope someone can help me kelgorreeks Introductions 2 08-29-2010 06:59 PM
hope this works Switch Suspension and Steering 8 11-12-2009 07:43 AM


Vote for Jeep-CJ.com