leaking brake fittings 47 1 ton pickup

[Robin 47 ford pickup]

Hi guys , I have problem with brake fluid leaking from the rear wheel cylinder brass fitting between the brass block and the slave cylinder on both sides at the rear . I have copper washers on both sides of the brass block , but it only leaks on the slave cylinder side. Now ,the brass block has 6 or so grooves machined into it on both the clamping surfaces . Can any one tell me were these brass blocks made so you don't use copper washers? This leak is pissing me off . Any fixs for this
cheers Robin

[alanwoodieman]

are you using silicone fluid? if so the molecules are smaller than convential fluid and are hard to stop leaking. the grooves are there so the soft copper washers will indent and help stop any chance of leaking. one copper washer per connection and tighten with appropriate wrenches so a lot of torgue can be applied

[51 MERC-CT]

If you can't get new (soft) copper washers then heat the old ones up to cherry red and immediately quench in cold water.
This brings the work hardened old washers back to softened condition.
Worked every time for me and I am using silicone brake fluid.

[john in illinois]

Also if you tighten them, loosen and then tighten again this helps.

John

[34PKUP]

Originally Posted by john in illinois

Also if you tighten them, loosen and then tighten again this helps.

John

Heard of that for the flared fittings but not for the copper washers.

[Doublepumper]

Sponsored Links (Register now to hide all advertisements)

I've fought leaking copper crush washers more than once....very frustrating. I finely decided to try stat-o-seals and have been very happy with them. No more leaks or fear of stripping fittings trying to get copper washers to seal. They work so well that I won't use copper washers anymore, unless absolutely necessary.

[JSeery]

Never heard of stat-o-seal so I looked them up:

Introduction
Most fluid systems have fasteners that must be sealed. Parker’s fastener seal designs found in the Stat-O-Seals® and ThredSeals® feature an elastomeric sealing element molded in place within a metal retainer (washer). Although resembling a simple o-ring groove concept, the mold in place fastener seal offers numerous advantages. Ideal for sealing small and miniature sizes, the Parker Lock-OSeal® is a two-piece combination seal comprising a separately molded o-ring fitted within a surrounding metal washer. Other speciality fastener seals are also available.

Stat-O-Seals
• Intended to seal the shank of a bolt immediately under the head
• 600 Series: Intended for sealing standard series fasteners
• NAS1523 Series: Applications that require conformance to NAS1523
• 610 Series: Intended for sealing metric fasteners from 5mm to 22mm
ThredSeals
• Intended for sealing directly on the fastener threads
• 750 Series: Intended for sealing most UNC and UNF threads
Lock-O-Seals
• 800 Series: Intended to seal the shank of a bolt immediately under the head
• Ideal for sealing small and miniature sizes
• Special material combinations not available as a 600 Series Stat-O-Seal
Specialty Products
• Fastener seal kits
• 250 Lock-O-Seals for sealing straight tube fittings and banjo style fittings
• Food, beverage and FDA related applications
• Custom designed fastener and fitting seals

[Hal Beatty]

Stat-O-Seals are really nice, I've used them on the aircraft a few times. They work great but are rather expensive. On Fords I've always annealed the copper washers and put a smear of Loctite 515 on them when assembling; works well.

[Mart]

Are the rear wheel cylinders finished with a flat surface for the copper washer to seat on to? I've never dealt with truck parts, but know the car cylinders don't have such a surface.

Mart.

[51 MERC-CT]

Originally Posted by Mart

Are the rear wheel cylinders finished with a flat surface for the copper washer to seat on to? I've never dealt with truck parts, but know the car cylinders don't have such a surface.

Mart.

"Now ,the brass block has 6 or so grooves machined into it on both the clamping surfaces ."

Quote from first post.

[JSeery]

"Now ,the brass block has 6 or so grooves machined into it on both the clamping surfaces ."

I read that as only the connection block, not the wheel cylinders?

I would start by trying annealed washers (as in post #3).

[Robin 47 ford pickup]

Hi guys , the groves are in the brass block on both sides . I am going to try those stat-o -seals , we call them something else over here . I now have the same problem at the master cylinder on the cylinder side. Can only be the silicone fluid , but I can live with it cause it don't take the paint off after all the hard work painting the underside
cheers

[GB SISSON]

I have owned and repaired 4 old BSA single cyl motorcycles. Solid copper head gaskets. Never bought a new one because an old guy showed me "Heat the old gasket cherry red, pick up with a coat hanger and drop in the toilet to anneal it". I'm no metalurgist, but it makes them soft again.

[burnette]

Originally Posted by Robin 47 ford pickup

Hi guys , the groves are in the brass block on both sides . I am going to try those stat-o -seals , we call them something else over here . I now have the same problem at the master cylinder on the cylinder side. Can only be the silicone fluid , but I can live with it cause it don't take the paint off after all the hard work painting the underside
cheers

hi ! i,m having the same problem. i have read on the stat o seals and they don,t seem to recommend them for brake systems. what other name do they have, i would really wish to stop my leaky bango fittings. do napa or car quest sell them !

[Robin 47 ford pickup]

I am told Stat-o-Seals or similar product wont last long in Dot3 4 and 5.1 fluid but should be OK with Dot5 . I seemed to have had a win with the rear wheel slave cylinders and the Stat O Seals , but I have to wait until the excess fluid from the leak on the master cylinder has gone to see if I have had any success there. The Dot 5 is bastard stuff for sitting in around washers and bolt heads then drops out and you think its still weeping around the seal


cheers

[burnette]

thanks !

[Robin 47 ford pickup]

The other names for these seals are Dowty washers or bonded rubber washers