Brake Problem
Thread Starter
|
Mountain Pass
Joined: Feb 2004
Posts: 152
Likes: 5
Brake Problem
Re: 2002 SD. Yesterday I my RR caliper was dragging. Upon inspection one of the pistons was frozen. I replaced it with a NAPA caliper. When replacing the caliper the level in the master cylinder reservoir went down less than an inch. I bled the caliper using a Motive Products pump type pressure bleeder. However, the brake pedal was now spongy so I bled it again as well as the LR caliper. No change - pedal still spongy. If I press on pedal slowly it goes almost to the floor. Brakes do still seem to work. I tried to bleed front calipers but they would only weep a little - do bleeder screws go bad? Everything was normal before I changed the caliper so I am thinking it is not a MC problem? Any thoughts on where problem lies?
THANKS
THANKS
Fleet Owner
Joined: Apr 2008
Posts: 24,322
Likes: 5,132
From: 0,0,1
It could still be a MC issue. What can happens is the seal inside the MC has travelled past the point it normally rides and can cause the seal to not seal good since the bore isn't as smooth in that unused area.
Thread Starter
|
Mountain Pass
Joined: Feb 2004
Posts: 152
Likes: 5
I replaced the master cylinder and got no improvement. There is no external leakage. My pressure bleeder goes to 15 psi so I am thinking that there is still air in the system. I am going to try manual bleeding.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
Bleed all the brakes, start at right rear, then left rear. Left front then right front.
Always keep the master cylinder full.
I like to bleed them all until fresh new fluid arrives at each corner.
Bleeding the brakes to me means "bleed ALL the brakes".
Bleeder screws could be clogged or the rubber brake hoses could be collapsed and blocking flow.
Or could be a master cylinder problem. It wouldn't be the first time a new one was bad right out of the box.
Always keep the master cylinder full.
I like to bleed them all until fresh new fluid arrives at each corner.
Bleeding the brakes to me means "bleed ALL the brakes".
Bleeder screws could be clogged or the rubber brake hoses could be collapsed and blocking flow.
Or could be a master cylinder problem. It wouldn't be the first time a new one was bad right out of the box.
Hotshot
Joined: Dec 2014
Posts: 17,830
Likes: 3,115
From: Jersey Shore
Or an ABS problem.
15 psi is not enough to do an effective bleed. Also, on that replacement caliper, are you sure the bleed screw is higher then the hose connection? If not, you have the wrong side caliper installed.
15 psi is not enough to do an effective bleed. Also, on that replacement caliper, are you sure the bleed screw is higher then the hose connection? If not, you have the wrong side caliper installed.
Thread Starter
|
Mountain Pass
Joined: Feb 2004
Posts: 152
Likes: 5
AND WE MAY HAVE A WINNER! The bleed screw is lower than the hose connection. The part # on the NAPA box is correct but the caliper is RL rather than RR. I will get the correct caliper and let everyone know the outcome.
THANKS
THANKS
Trending Topics
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread Starter
|
Mountain Pass
Joined: Feb 2004
Posts: 152
Likes: 5
Yes - despite the correct number on the box (NAPA new made in China) it contained RL instead of RR. I installed the correct caliper, bled the system and now have good pedal (at least by Super Duty standard.)
THANKS FOR ALL YOUR COMMENTS.
THANKS FOR ALL YOUR COMMENTS.
Hotshot
Joined: Dec 2014
Posts: 17,830
Likes: 3,115
From: Jersey Shore
Actually, it's not that rare as you may think with the early 1999-2004 trucks. The very early a real problem due to initially only having one caliper design, and on the driver's side fit to the front of the axle.
Thread
Thread Starter
Forum
Replies
Last Post
BNeu11383
1987 - 1996 F150 & Larger F-Series Trucks
5
Dec 12, 2011 05:06 PM