Re: [Amc-list] 1970 brake specs? PROP VALVE INFO!!

[Tom Jennings <tomj@xxxxxxx>]

Thanks for the post Frank!

Ahh, so it appears then that all the metering/proportional
fiddling ended with the use of Bendix calipers. The one
exception is that mid-year Matador, and that's probably parts-bin
issues. Front metering costs the factory a few pennies, and maybe
saves the owners a few pennies but over a longer period of time,
but otherwise isn't needed.

Clearly for a dead-stock car that you're keeping that way,
it doesn't really matter what the brakes are, you just replace
worn parts. My previous post assumes that you are retrofitting
(besides just figuring out what year had what part) and then
it's nice to know what works.


> DISC BRAKE BALANCING

Cool! This jives with what I found so far, I'll save it and
note any changes when I get all the data together.





On Sat, 24 Feb 2007, farna@xxxxxxx wrote:

> DISC BRAKE BALANCING
>
> 1965-67 - Bendix non-servo rear brakes, which have no "wedging" (servo) action were used on the rear, reducing rear braking power. Calipers are four piston Bendix.
>
> 1968-70 - A separate proportioning valve is mounted on the right rear chassis rail just before the rail kicks up over the axle. This is clear in the 70 TSM -- see page 10-7. Calipers are four piston Bendix.
>
> 1971-74 - A three-way combo valve (metering/warning/proportioning) is used. Kelsey-Hayes 2.75" piston calipers are used. The valve has five connections -- two in and three out (one for each front wheel).
>
> 1975-76 - Two-way combo valve (metering/warning) is used with 3.1" piston "Big Bendix" calipers. Bendix calipers slide on the anchor plate (frame), K-H calipers slide on screw-in pins. These valves also have five connections -- the same as the earlier three-way. Metering requires two outlets from the valve for the front wheels.
>
> 1977-78 - Only early production (presumedly those made in 1976) 77 Matadors have the two-way (metering/warning) combo valve. All other cars have no brake balancing device at all -- just a junction block with pressure differential valve. Matadors (last year is 1978)continue using the Big Bendix caliper, all other cars use a 2.6" piston Bendix caliper.
>
> 1979 - ??? I don't have a 79 TSM! I know the rotors used for 77-78 are different from 79+ -- the wheel bearings are different. Tom and I both would really appreciate someone looking this up in their 79 TSM!!
>
> 1980-88 - 80-81 cars use 2.6" Bendix calipers, 82-88 use 2.6" GM calipers that slide on pins similar to the 71-74 K-H calipers. The brake hose thread changed -- earlier hoses will all interchange, but won't fit the 82-88 calipers. 1980 Pacer (last year) uses the same set-up as previous models - no balancing device. All others use a two way combination valve with warning/proportioning functions, no metering. These will have a T in the front line between the master cylinder and combo valve for the left front caliper. The combo valve will have only four connections -- two in and two out. Two different style valves were used, but both functioned and were plumbed the same.
>
>
>
>
> --------------
> Date: Fri, 23 Feb 2007 15:00:10 -0800
> From: Mark Price <markprice242@xxxxxxxxxxxx>
>
> OK, what was on 82-83 Concords?
> Is it a combo valve with metering or not?
> I've got two here, no sense in even trying to install one if they don't meter.
> --
> Mark Price
> markprice242ATadelphia.net
> Morgantown, WV
>
> --
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
>
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