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Larry the Lariat - My 86 F150 4x4

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Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

Seals on a 9" are "fun". You have to drill or otherwise crack the retainer and use a press to put a new one on.

As for the master cylinder, would you be interested in upgrading to a later model one? The ones with an aluminum base and plastic reservoir? You won't have the rusting hulk of the cast iron one, and it won't leak like the old ones do. Plus, it makes bleeding the system a lot easier if you get a replacement cap, put an air connection on it, and then use something like a garden pump-up sprayer to put a few psi on the reservoir.

You need to buy one with a residual pressure valve on it, and Rock Auto sells one. If you are interested I'll find the part number.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

chirkware

Re: Larry the Lariat - My 86 F150 4x4

Gary Lewis wrote

Seals on a 9" are "fun". You have to drill or otherwise crack the retainer and use a press to put a new one on.

As for the master cylinder, would you be interested in upgrading to a later model one? The ones with an aluminum base and plastic reservoir? You won't have the rusting hulk of the cast iron one, and it won't leak like the old ones do. Plus, it makes bleeding the system a lot easier if you get a replacement cap, put an air connection on it, and then use something like a garden pump-up sprayer to put a few psi on the reservoir.

You need to buy one with a residual pressure valve on it, and Rock Auto sells one. If you are interested I'll find the part number.

Sounds intriguing. Does it require changing the booster?

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

No, you don't have to change the booster. You might be interested in the thread Master Cylinder Upgrade Part Numbers.

Gary, AKA "Gary fellow": Profile

chirkware

Re: Larry the Lariat - My 86 F150 4x4

In reply to this post by chirkware

These pictures are from January, 2023, when I was going through the brakes before:

I blamed all that on a leaking wheel cylinder, which I replaced. Yet the wheel cylinder doesn’t even look wet in that last picture.

It wasn’t this bad when I opened it up Saturday, but it was getting there.

Gotta be the axle seal right?

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

I agree that the wheel cylinder looks dry, and those shoes don't look like ones with brake fluid on them. Brake fluid soaks in and makes them grabby. That looks like 80/90W and they look slick. Has to be the wheel bearing seal.

Gary, AKA "Gary fellow": Profile

chirkware

Re: Larry the Lariat - My 86 F150 4x4

Does this look right for an axle bearing / seal kit?

https://a.co/d/5LjIGXp

The listing says it’s correct for 2wd but Larry is a 4wd. Would 4wd be different?

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

Looks right to me - if you have a 9". I dialed in Dad's truck, which has a 9", and it is right for it. Don't think there's a difference between a 2wd or 4wd 9".

Gary, AKA "Gary fellow": Profile

chirkware

Re: Larry the Lariat - My 86 F150 4x4

Gary Lewis wrote

Looks right to me - if you have a 9". I dialed in Dad's truck, which has a 9", and it is right for it. Don't think there's a difference between a 2wd or 4wd 9".

Thanks Gary!

No rear cover on the housing, so I would presume that means it’s a 9”.

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

ArdWrknTrk

Re: Larry the Lariat - My 86 F150 4x4

Administrator

In an 86 150, yes.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

chirkware

Re: Larry the Lariat - My 86 F150 4x4

Thanks again guys!

I'm about to pull the trigger on a RAYBESTOS MC39634 from Rock Auto:
https://www.rockauto.com/en/moreinfo.php?pk=309797&cc=1122398&pt=1836&jsn=2507
I specced a 1996 F150 and that was the number that came up, same as from the thread Gary posted.

Also was going to order oil for the 9" rear. Figured I'd also change fluid in the front diff at the same time. Rockauto has Motorcraft 80W-90 (same warehouse, so one shipping charge!), which is what I used in my 70 F100, so I was going to go with that. Does that seem like the right choice? From what I'm seeing, I'd need about 3Q for the rear and 1.5Q for the front. Does that seem about right? I figured I'd order 6Q to be sure I have enough.

Any other "while I'm there" items you'd suggest? I've got a three day weekend with nice weather (my driveway is my shop!), so I plan to tackle this soon. Looks like Rock Auto can have it all here Friday if I order soon. :)

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

That looks good. The listing doesn’t show the residual pressure valve, which you need, but Larry said it came with his.

And the lube looks good. But you will need a suction gun to pull the old lube out.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: Larry the Lariat - My 86 F150 4x4

Administrator

Haven't looked at the RockAuto price but let's not forget there's one languishing on eBay the U-Haul parts store does they have it listed as a 97 instead of an 87
E 7 t z-xxxx

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

mat in tn

Re: Larry the Lariat - My 86 F150 4x4

on a 4wd the rear can be a trac loc "posi" that may require you to use a friction modifier also. look at the tag and decode the numbers there or look in th door jamb for the axle code and check in documents.

chirkware

Re: Larry the Lariat - My 86 F150 4x4

In reply to this post by Gary Lewis

Gary Lewis wrote

But you will need a suction gun to pull the old lube out.

Think something basic like this would suffice?

https://www.harborfreight.com/multi-use-transfer-pump-63144.html

On my 70, i sucked the old out with a brake vacuum bleeder, but that was no fun!

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

chirkware

Re: Larry the Lariat - My 86 F150 4x4

In reply to this post by mat in tn

mat in tn wrote

on a 4wd the rear can be a trac loc "posi" that may require you to use a friction modifier also. look at the tag and decode the numbers there or look in th door jamb for the axle code and check in documents.

Good point!

Axle code 16, looks like 3.50 non-locking.

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

chirkware

Re: Larry the Lariat - My 86 F150 4x4

In reply to this post by ArdWrknTrk

ArdWrknTrk wrote

Haven't looked at the RockAuto price but let's not forget there's one languishing on eBay the U-Haul parts store does they have it listed as a 97 instead of an 87
E 7 t z-xxxx

$41.79. More importantly, it should get here Friday so i can install this weekend. And supposedly has a lifetime warranty, though I’m not sure how that’s handled.

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

ArdWrknTrk

Re: Larry the Lariat - My 86 F150 4x4

Administrator

I think U-haul wants ~$55
Their shipping is OTD that day.
I've NEVER had a problem with them.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

chirkware

Re: Larry the Lariat - My 86 F150 4x4

In reply to this post by Gary Lewis

Gary Lewis wrote

That looks good. The listing doesn’t show the residual pressure valve, which you need, but Larry said it came with his.

A friend had one of the residual pressure valves in his stock, so I’m covered if the one I ordered doesn’t have it. I’ve read conflicting info as to whether it’s ok to run this valve plus the factory proportioning valve (or combo valve it whatever we want to call it), with some saying to gut the residual pressure valve in that situation so it’s just an adapter.

Also, I’ve read that it may be necessary to adjust the pushrod, but i haven’t seemed to find what adjustment is needed for that. I did find this:

I’m guessing though that’s what we need for the factory master cylinder, but not what we need when running a newer master cylinder. Does it just need to be adjusted to whatever was the spec for 87-96?

Ole Blue -- 1970 F100 Custom, 240 and a C4 automatic
Larry the Lariat -- 1986 F150 XLT Lariat 4x4, 351w and a C6 automatic

ArdWrknTrk

Re: Larry the Lariat - My 86 F150 4x4

Administrator

Multifunction valve.....
At least, that's what Ford calls it. 🤷‍♂️

You can just get a fitting that adapts it, much like the fitting you need to put a normal brake line onto the rear axle splitter on the driver side. 💡
It's metric!

I've always gone for an inch of stick out.
Never had any idea there was an official dimension.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Larry the Lariat - My 86 F150 4x4

Administrator

I'm running the multifunction valve in addition to a residual pressure valve and have no problems.

On the push rod, the adjustment is sort of critical as too little and you'll have a bit of slack in the pedal, but too much and the brakes drag, which means they get hot and expand and drag more, which means...

Welder Scott and I adjusted his to get the slack out. That night his son drove the truck a few miles and all of a sudden the brakes locked up. They'd been smelling something for a minute or two and pulled into a parking lot just before they locked. And they weren't going anywhere until they cooled down.

Gary, AKA "Gary fellow": Profile

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