Vintage Mustang Forums banner

1 - 20 of 31 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter #1 (Edited)
Hi everyone - my 68 had a 67 instrument bezel in it and I'm going back to a 68 bezel. I didn't realize, though, until I received the new bezel that I don't know what lenses fill in the gaps on the top left and right - I'm assuming the left is the wiper control like the 67? But I don't know what goes on the right side, and the 67 bezel that came with the car doesn't have the same parts to transfer over (I think). I can't find a picture on the internet to show me what it should look like. Can anyone help?
756514
 

·
Registered
1968 Coupe, 302/T5
Joined
·
61 Posts
On the left you are correct, on the right it has indicator lights for the seatbelts and brakes. Curious, what’s your plan for the ‘67 bezel? Mine is a ‘68 also, but has a deluxe bezel Despite having a camera case dash.
 

·
Registered
Joined
·
2 Posts
Hi everyone - my 68 had a 67 instrument bezel in it and I'm going back to a 68 bezel. I didn't realize, though, until I received the new bezel that I don't know what lenses fill in the gaps on the top left and right - I'm assuming the left is the wiper control like the 67? But I don't know what goes on the right side, and the 67 bezel that came with the car doesn't have the same parts to transfer over (I think). I can't find a picture on the internet to show me what it should look like. Can anyone help? View attachment 756514
I believe it’s a “brake” warning light. Mine has never come on, but when I did the dash restoration, that’s what the lens had printed on it. At least, that’s my recollection. Next time I drive it, I’ll double check.
 

·
Registered
Joined
·
5,104 Posts
The brake and seat belt light are options, not on most cars.
 

·
Registered
Joined
·
91 Posts
The brake and seat belt light are options, not on most cars.
if you dismantle the back of the bezel, you’ll see a small black piece of gasket-like material that fits over the rear of that lens. On one side are the words “BRAKES and SEAT BELTS”, the other side is blank. If the car was equipped with the convenience option, the words face out, and without that option the blank side faces out. I still haven’t figured out how the words get illuminated— the piece of lens-backing material is opaque...
 

·
Registered
Joined
·
823 Posts
The brake and seat belt light are options, not on most cars.
What option would provide a brake light, and what function would that light perform?

I believe it’s a “brake” warning light. Mine has never come on, but when I did the dash restoration, that’s what the lens had printed on it. At least, that’s my recollection. Next time I drive it, I’ll double check.
I believe this to be correct for the brake light being discussed here. It is a brake warning light, driven from the sensor mounted to the brake distribution block. If either side of the master cylinder has a low fuel level, a shuttle valve moves and triggers the sensor. There should be a "proof" circuit that proves out the light when you start the car. There are several posts here discussing this in more detail.

if you dismantle the back of the bezel, you’ll see a small black piece of gasket-like material that fits over the rear of that lens. On one side are the words “BRAKES and SEAT BELTS”, the other side is blank. If the car was equipped with the convenience option, the words face out, and without that option the blank side faces out. I still haven’t figured out how the words get illuminated— the piece of lens-backing material is opaque...
I don't think that this is accurate. The convenience control option for 68 included four round lights, located in either the center dash piece or the console if AC equipped, just like for the 67 model year. The brake warning light was discussed above. To address the seat belt light, that is something I'm not knowledgeable in for 68 models. I can say for 67 if you ordered deluxe seat belts you would get an add-on seat belt reminder light. For 67 if you ordered the convenience control option, with or without deluxe seat belts, the add-on seat belt reminder light was not installed because the function was part of the convenience control option.

My conclusion, hoping that someone with 68 specific knowledge can confirm or correct where necessary, is:

1. The instrument panel "brake" light is the warning light, informing the driver of a potential loss of braking capacity. It is standard on all cars. There is a proof circuit to test the bulb when cranking the engine. (The "brake" light that is part of the optional convenience control option will light up when the parking brake is applied, a completely different function.)
2. The instrument panel "seat belt" light is a light to remind the passengers to buckle up. It will come on when the key is moved to the run position, and will time out after 15-30 seconds. For 67 this was optional with deluxe belts. I don't know if that is also the case for 68, or if it was standard. (The "seat belt" light that is part of the optional convenience control option would take the place of the instrument panel seat belt light, rendering the instrument panel light as moot.)

Whether the seat belt light was standard or optional, the lens would be installed on all cars.
 

·
Registered
Joined
·
35,250 Posts
67gta289 is quite right, the BRAKE light was federally mandated standard equipment, and indicates balance failure of the brake system.
 

·
Registered
Joined
·
3 Posts
Discussion Starter #9
Thanks for all the education! I just want it to get filled in so it's not a blank slot. I bought the lens off eBay, hopefully it fits, even if the lights don't work. Thanks again!
 

·
Registered
Joined
·
2 Posts
I believe it’s a “brake” warning light. Mine has never come on, but when I did the dash restoration, that’s what the lens had printed on it. At least, that’s my recollection. Next time I drive it, I’ll double check.
Confirmed. There are “brake” and a “belts” warning lights there. Mine doesn’t have the sensors to make them work, but the little lenses are there.
 

·
Registered
Joined
·
91 Posts
What option would provide a brake light, and what function would that light perform?





I don't think that this is accurate. The convenience control option for 68 included four round lights, located in either the center dash piece or the console if AC equipped, just like for the 67 model year. The brake warning light was discussed above. To address the seat belt light, that is something I'm not knowledgeable in for 68 models. I can say for 67 if you ordered deluxe seat belts you would get an add-on seat belt reminder light. For 67 if you ordered the convenience control option, with or without deluxe seat belts, the add-on seat belt reminder light was not installed because the function was part of the convenience control option.
I should qualify my statement by saying that this applies to a 1968 Shelby GT500. I had the instrument bezel apart 2 weeks ago, so I do have personal experience and stand by my claim. I wish I had taken pics. I cussed out that little tag a dozen times as I re-assembled the bezel — the GD thing refused to stay in place as I put everything back together! Grrrrr.
 

·
Registered
Joined
·
823 Posts
Confirmed. There are “brake” and a “belts” warning lights there. Mine doesn’t have the sensors to make them work, but the little lenses are there.
Sam - all 67 and later Fords with separated front-rear brake reservoir had a distribution block with sensor and wiring and proof circuit.

Pictured below is a 67 model with the connector unplugged. For 68 there was a change to a two-wire design but the overall concept remained the same.

Please check the brake distribution block near the master cylinder and report back. I suspect that the sensor is there, or the sensor was removed and hole plugged.

756649
 

·
Registered
Joined
·
848 Posts
It's not really a "sensor," but a spring loaded pin. If the pressure between the two circuits is unequal (such as if one circuit fails) the different pressures will move a piston in the block which allows the pin to drop and connects the two wires electrically. Attached is a diagram for a F-100, but the wire colors and numbers are the same.

wiring_69brakewarninglight.jpg
 

·
Registered
Joined
·
35,250 Posts
A matter of semantics I suppose. It is the devise that senses a brake problem, hence the use of the term somewhat generically. It is also efficient; one word used ;)
I'd have called it a switch, but either way…

It does not connect two wires. The power goes to the dash light, then to the pin in the nylon-bodied switch/sensor. If the brake system becomes unbalanced, the pin inside the differential valve slides to one side, allowing the center pin to touch one of the thicker ends, grounding the circuit and illuminating the dash light.

The 67 switch had only one wire. 68-up had two, so the "start" circuit would illuminate the light as a test.
 

·
Registered
Joined
·
823 Posts
Switch also works. But I don’t think you are correct regarding the two wire 68 design. For 67 the ground path went through the pin, touching the brass spool valve, making contact with the brass distribution block, then through the steel bracket and mounting bolt, then to the apron. A somewhat precarious and unreliable design. I thought that the second wire on the 68 was for a dedicated ground. I need to find a wiring diagram, all of mine are for 67. Also, 67 had a proof circuit as well. The ground was through the spade terminal on the ignition switch contact that closed when cranking. The proof circuit was not introduced for 68.
 

·
Premium Member
Joined
·
6,187 Posts
Because I didn't like the under dash location for my '68 parking brake (on/off) warning light (couldn't see it there in daylight), I repurposed that brake warning light location y'all are discussing for the parking brake light. I can't miss it there and won't inadvertently drive off with the parking brake still engaged. I did that once, a rather bad odor as a clue and some amount of grief after. No more.
I mention this because someone else may see the same advantage.
 

·
Registered
Joined
·
656 Posts
I have a 68. Here are some take apart photos when in was swapping in a new odometer this winter. Seatbelts on my green lens nothing no bulb behind it. Other says ‘Brake.‘ Never tested it. But there is a light. Pulling e-brake does not activate the light. Unsure if it should. But on my reverse view it’s top left bulb.

The other one top left on front in your view is where your wiper switch arm and the little shiny knob piece that says ‘wiper’ comes through. Held in by a small hex key.
 

Attachments

·
Registered
Joined
·
5,104 Posts
I misspoke earlier. All the 68s have the Brake warning light.

The Belts light appears to have been never used. They instead either mounted up it under the dash like in 67, or it was included as part of the convenience group mounted in the console or panel above the radio.

i have never seen a car with the warning light installed in the dash even though the space is there. On my car I took advantage of the lens and installed a original Ford warning light there instead of using the under dash light. The wiring had the correct socket for the instrument cluster so maybe some cars did come with them. I’ll hav to look through my books and see if there is any reference to it.

756754


756755
 

·
Registered
Joined
·
210 Posts
Those two pins on top of a '68 brake light switch are connected together. I have a '67, but only the '68 switch is available as a replacement. So you have to rig up an adapter or cut the lead from a '68 harness. Anyone got a scrap '68 harness they can cut the brake warning switch lead from for me?
 
1 - 20 of 31 Posts
Top