Brake fluid reservoir top screws

Anybody know what size screws are in the top of the brake fluid reservoir top? There are rusted pretty bad so I sprayed some penitrating oil on them a few times over the course of a couple of days. Still would not turn. Used an impact screw driver and that just torn them up. Now I just have a countersunk screwhead. Does anybody know what size of screws they are? I am going to drill and use a screw extractor but would like to have the new replacements before I do that.

 

I had the same thing happen to mine. I drilled the hole and tried the screw extractor. Except it broke off. Ended up getting a whole new master cylinder

 

Here they are!


Master Cylinder Cover Screws:

mc16) Master Cylinder Reservoir Cover Screws: they're always buggered up, and there's never a better time to replace these than now! Offered in a variety of both stock (philllips-drive) and hex-drive configurations, in both plain and stainless steel.

NOTE: Original reservoir cover screws on all models were always black plated. If you wish to retain the original appearance of the screws that we offer that are zinc- or bright-plated, a quick little spray of black paint will fix that.....


The following screws fit all of these models: 1981-82 XJ550 all models, all XJ650 (except Turbo) models, 1982 XJ750 Maxims, and XJ1100 models:

HCP3040 OEM front Master Cylinder Reservoir Cover flathead SCREW, plain steel with a dark gray phsophate coated finish, phillips-drive. Each:
$ 1.50
$ 2.50 per pair


HCP5891 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, plain steel with a zinc-plated finish, phillips-drive. Each:
$ 1.00
$ 1.50 per pair


HCP5893 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, 18-8 stainless steel with a bright finish, phillips-drive. Each:
$ 1.50
$ 2.75 per pair


HCP6572 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, 18-8 stainless steel with a black-oxide coated finish, phillips-drive. Each:
$ 1.25
$ 2.25 per pair


HCP6557 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, plain steel with a black-oxide coated finish, with a 2.5mm hex-drive head. Each:
$ 1.00
$ 1.75 per pair


HCP6558 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, 18-8 stainless steel with a bright finish, with a 2.5mm hex-drive head. Each:
$ 1.00
$ 1.75 per pair



The following screws fit all of these models: 1983 XJ550 all models, all XJ650 Turbo models, XJ700 all models, 1983 XJ750 Maxim and Midnight Maxim models, and XJ900RK Seca models:

NOTE: some 1981-2 XJ550 models may also use these longer screws as specified only for the 1983 XJ550 models. You may wish to measure the overall height of your original screws before ordering. The 1981-2 screws are a total height of 10mm, while the 1983 screws are 12mm in total height. While it is acceptable to use the shorter screw in place of the longer ones, it is not possible to use the longer screws in place of the shorter ones.

HCP3041 OEM front Master Cylinder Reservoir Cover flathead SCREW, plain steel with a dark gray phsophate coated finish, phillips-drive. Each:
$ 1.25
$ 2.00 per pair


HCP6559 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, plain steel with a zinc-plated finish, phillips-drive. Each:
$ 1.00
$ 1.50 per pair


HCP6550 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, 18-8 stainless steel with a bright finish, phillips-drive. Each:
$ 1.50
$ 2.75 per pair


HCP6561 Replacement Master Cylinder Reservoir Cover Plate flathead SCREW, 18-8 stainless steel with a black-oxide coated finish, phillips-drive. Each:
$ 1.25
$ 2.25 per pair


HCP6562 Replacement Master Cylinder Reservoir Cover Plate socket head CAP SCREW, plain steel with a black-oxide coated finish, with a 2.5mm hex-drive head. Each:
$ 1.00
$ 1.75 per pair


HCP6563 Replacement Master Cylinder Reservoir Cover Plate socket head CAP SCREW, 18-8 stainless steel with a bright finish, with a 2.5mm hex-drive head. Each:
$ 1.00
$ 1.75 per pair

 

I really hope that my extractor doesn't break off. Do you know what size of screws they are?

 

I just took the broken one out and to my hardware store and bought some new screws for a few cents each. I also switched to bolts so they don't strip again.

 

I was told that they are 4mm dia. x 10mm long tappered head if anybody was wondering.

 

We just went through this. Had to drill off the head of the old one then remove the cap and tried to vice grip the left overs out. No luck so I ended up drilling the old bolt out. When I went to recut the threads (I drilled smaller then the bolt) and clean out the bolt I broke off the tap - doh!

Ended up welding a small drip on the end and the broken tap turned right out!

Saved the master that way!

Sean

 

I just went to the local nut and bolt store and got 2 new screws. They use a hex bit instead of the phillips. Total cost = $0.15

 

Thanks guys for the tips! I am going to pickup a couple tonight and hopefully I can get hex head stainless. I know that Chacal has them but $8-9 with shipping is a bit much for two small screws. I guess that if I can't find them then I will just get a bigger order together for Chacal so the shipping is spread out.

Note: Chacal: Your great man, fast shipping, good prices and you seem to have everything. Keep it up.

 

Thanks! I keep trying.

And if you just order screws, the shipping is much mor e reasonable (like $ 1.50) for them via first class mail!

 

Chacal,
I was not aware of that, thanks for the info. Man I knew you where good! Fair price for shipping such a small amount.

 

this is a time when an impact screw driver is handy!

( the type that has a screwed shape driver, and a handle that rotates down the driver shaft... give it a whack with a hammer and it forces the screw driver into the screw, and twists it in one motion... )

 

"it forces the screw driver into the screw, and twists it in one motion..."
or it just rips the screw head all up...

I used an impact screw driver, made sure it was tight in the screw head and that it was straight up and down. Just ripped the screw head up, now it is almost countersunk. That screw is not coming out without the hand of God, or a drill.

 

I got nice replacement screws at the local Ace Hardware. Had a nice variety of metric Allen head screws as well.

Local Carquest auto parts store also has a nice selection of metric o-rings, which has been quite handy as well.

 

Good to know! Thanks.

Well I drilled and extracted tonight, worked great! I did get a 4 pack of phillips head 4x10mm from Home Depot for $0.54 and they went right in. I looked a two different places for allen head screws but did not find any. I will keep my eyes open for a stainless set of allen heads and when I find them I will replace the ones I have in there now.
Good thing I got it opened, it was about out of fluid. The bottom hole was still covered but the top one was about half exposed, and pluged with a bunch of brown goo. While I was in there I gave it a light cleaning and flushed the system with new fluid. The front brakes feel much better now. Now I just have to give it a good cleaning (any ideas on this?) and install the new sight glass that I got from Chacal, then bleed and refill again.