master cylinder
Thread Starter
|
New User
Joined: Apr 2015
Posts: 2
Likes: 0
master cylinder
hey guys so I've replaced my master cylinder on my 67 f100 and now I've got brake fluid leaking all around the cap done everything but replace the cap and seal and it seems like every little thing I do to try to stop it makes it worse any suggestions are helpful
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
ark, Welcome to 
and the Bumpside Forum. 
I have had the same happen, and made a second gasket from innertube. You may also try bending the wire clamp for a tighter grip. Do you by any chance still have to old one that you could double up with?
Lastly, take it off and take it back.
John
and the Bumpside Forum. I have had the same happen, and made a second gasket from innertube. You may also try bending the wire clamp for a tighter grip. Do you by any chance still have to old one that you could double up with?
Lastly, take it off and take it back.
John
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
If you have the Chinese made one like, I bought then it will keep leaking.
I've found they changed the lid cover air vent to the side lip wall area that pukes B-fluid no matter what you do.
I found a new aftermarket chrome one made to the OEM type specs where the air vent is in the upper top of the lid cover near the wire clip lock area.
Orich
I've found they changed the lid cover air vent to the side lip wall area that pukes B-fluid no matter what you do.
I found a new aftermarket chrome one made to the OEM type specs where the air vent is in the upper top of the lid cover near the wire clip lock area.
Orich
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
If it is a remanufactured part, the top edge is probably rusted and pitted where the rubber seal is supposed to seal. In which case it's not going to seal. I took mine off, put it in the mill and killed off the top surface until it was down to smooth clean metal again. You could use a large flat file, or maybe smooth the pits with some rtv, but i don't know if it's brake fluid resistant or not.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
2X Orich and 351 at the same time. They are both at the same thing but didn't know it. I think it prolly is the cap as Orich stated. With the Chinese vent going across the cap's sealing surface it creates an uneven sealing surface just as 351's pits would. I'd try an aftermarket chrome cap like Orich did. If your sealing surface is pitted as 351 posted, File away from the brake fluid. We don't want any foreign media in the brake fluid. And be quick about it. Brake fluid sucks up moisture out of the air like you read about.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
1967/72 F100/350: FOUR different master cylinder caps, THREE different master cylinder cap gaskets.
Buying a master cylinder from an auto parts store: What was its exact application?
Buying a master cylinder from an auto parts store: What was its exact application?
Trending Topics
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Using a File hmm, I'd remove the M/c dump the B-fluid and clean it with alcohol or a fast spray of brake cleaner. May be put a rug inside keep out any crap. I'd use some large sheets of pretty rough & fine wet & dry sandpaper.
Turn the cylinder upside down with the open well facing the sandpaper and block sand the sealing surface area until it will seal good.
Clean rinse out air dry. Bench bleed check for any grit from sanding in fluid as your bleeding cyl. then install it. Now only if all pitted leaking from their.
I ordered a new Master form Rock Auto that ended up at costing me $58 bucks with tax & Shipping.
If, I knew it was going to end up costing this much, I'd bought it at a loco part store and returned it with the funky lid the way the Chinese altered the vent was about the dumbest think, I've ever seen do and why.
If it's was not broken don't fix it when it worked for so many yrs.
I even tried to flatten out the side cap vent level but still leaked but not as much.
Even there wire retainer clip was thinner gauge wire and just bent out of shape and would not hold any pressure on the lid cap..
I promised myself to never buy brake parts again online, turn around time takes to long when your need your vehicle back on the road sooner then 10-12 days if your lucky it with in that time slot..
Orich
Turn the cylinder upside down with the open well facing the sandpaper and block sand the sealing surface area until it will seal good.
Clean rinse out air dry. Bench bleed check for any grit from sanding in fluid as your bleeding cyl. then install it. Now only if all pitted leaking from their.
I ordered a new Master form Rock Auto that ended up at costing me $58 bucks with tax & Shipping.
If, I knew it was going to end up costing this much, I'd bought it at a loco part store and returned it with the funky lid the way the Chinese altered the vent was about the dumbest think, I've ever seen do and why.
If it's was not broken don't fix it when it worked for so many yrs.
I even tried to flatten out the side cap vent level but still leaked but not as much.
Even there wire retainer clip was thinner gauge wire and just bent out of shape and would not hold any pressure on the lid cap..
I promised myself to never buy brake parts again online, turn around time takes to long when your need your vehicle back on the road sooner then 10-12 days if your lucky it with in that time slot..
Orich
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
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
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
Lesson to be learned:
Never turn in a core until you know the replacement actually works.
That way there is no pressure at the store to complete the transaction. If something goes awry, then the replacement and original can be closely inspected and compared.
Never turn in a core until you know the replacement actually works.
That way there is no pressure at the store to complete the transaction. If something goes awry, then the replacement and original can be closely inspected and compared.
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
What would a buyer think when seeing those red-neck mickey mouse fixes the rest of the trucks condition.
Orich
Thread
Thread Starter
Forum
Replies
Last Post
marksman76
1987 - 1996 F150 & Larger F-Series Trucks
0
Jan 21, 2019 07:04 PM
Mikulh
1961 - 1966 F-100 & Larger F-Series Trucks
4
Sep 9, 2011 08:16 AM
ncalsurfer
1961 - 1966 F-100 & Larger F-Series Trucks
4
May 6, 2002 05:10 PM