Electric parking brake - Vintage Mustang Forums
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post #1 of 30 (permalink) Unread 06-21-2019, 12:21 AM Thread Starter
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Electric parking brake

I went to the junkyard last week and found some electric calipers on a 08 passat. They where in good shape so I picked them up. I did a bunch of research on them and found that they would require the parking brake control module, parking switch, abs control module, stop switch, and at least one speed sensor. So that's what I got.
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post #2 of 30 (permalink) Unread 06-21-2019, 12:27 AM Thread Starter
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Now that I had all of the components i needed to make them fit my 1965 mustang. Now for most of you you might have to figure out some of this on your own because i have a 1998 explorer rear end. First i had to figure out how to mount the bracket on the baking plate. I thought a 2000 mustang plate looked promising but the center hole is too small and the bolt pattern is wrong. So let's start fabrication. First in paper to get a starting pattern. Next in cardboard. Now the silver line represented the biggest rotor I could use.
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post #3 of 30 (permalink) Unread 06-21-2019, 02:09 AM Thread Starter
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I now have it made out of wood so I could have something to bolt the caliper brackets to. The rotor that I used was off of a 2002 Ford explorer. But the drum extended past the back of the rotor so I had to pr it on a lathe and cut off the excess. The spacing for it is perfect. I trimmed the splash shield because it interfered with the caliper bracket.
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post #4 of 30 (permalink) Unread 06-21-2019, 10:57 AM Thread Starter
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Here is the tolerances that I got when I finished. The pads set on the rotor just enough, the is a few mm on the bottom to the pad top the hat of the rotor, and the clearance between the rotor a and the brake caliper is 3.5mm and 3.2mm. The bolts from the Passat where a little long so I had to shorten them, a little side note a 3/8 ratchet will fit in the bolt without a socket. Here is the finished brake install. Now on to the electric install.
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post #5 of 30 (permalink) Unread 06-21-2019, 12:07 PM
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You trust your battery with your life? It may be unlikely that your battery will fail when you need an E-Brake....but it is FAR more likely it will fail with the car parked and the brake is in use as a parking brake...would be bad in some circumstances. No, an electric(or hydraulic) E-brake is one modification that is just plain dangerous. They are mechanical for very good reason.
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post #6 of 30 (permalink) Unread 06-21-2019, 12:49 PM
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Our new Expedition has an electric parking brake and I HATE it. It auto-engages on level ground most of the time, does NOT auto-engage when on a slope (DUH) that would both make sense AND would take tension off the drivetrain when shifting to and from Park. Also, what happens if there is a hydraulic brake failure and it needs to be used gradually to safely slow and stop the car? I like being able to feel the tension and KNOW when my E/park brake is working. Don't get me started on that danged auto engine-stop BS...
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'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories
•Original Styled Steel Wheels
...my first car

'66 Emberglo / Parchment coupe
•289 / 2100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Power Steering
•Dealer Air Conditioning •Console
...son's first car


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post #7 of 30 (permalink) Unread 06-21-2019, 02:52 PM Thread Starter
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The electric parking brake is used for just that...parking, technically there is no emergency brake in a car. If you don't believe me go read your manual. You have a dual master cylinder with two reservoirs so if one goes our you have the other. And my current parking with the old school pull handle would not hold my car let alone stop it in an emergency. Now this is a mod page for modding our cars and I am just trying to show how I did it. If we all keep saying what we don't like we might as well keep our cars stock.
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post #8 of 30 (permalink) Unread 06-21-2019, 03:03 PM
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Originally Posted by [email protected] View Post
The electric parking brake is used for just that...parking, technically there is no emergency brake in a car. If you don't believe me go read your manual. You have a dual master cylinder with two reservoirs so if one goes our you have the other. And my current parking with the old school pull handle would not hold my car let alone stop it in an emergency. Now this is a mod page for modding our cars and I am just trying to show how I did it. If we all keep saying what we don't like we might as well keep our cars stock.
Well, I said I hated the one on the Expedition. I LIKE that you're modding and improving your ride and showing others how you are doing it. My e-brake / p-brake SAVED my butt once in town when the single bowl master cylinder went out. That, with down-shifting, got me stopped safely and I limped home where I could pull it apart and put another master cylinder on. I won't be able to do that so easily in some modern vehicles. I'm researching how to reprogram the Expedition.

Electric parking brake : very cool
No emergency brake : not cool

'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories
•Original Styled Steel Wheels
...my first car

'66 Emberglo / Parchment coupe
•289 / 2100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Power Steering
•Dealer Air Conditioning •Console
...son's first car


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post #9 of 30 (permalink) Unread 06-21-2019, 03:18 PM
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Wow, your dedication to modifying a 50+ year old car is admirable. Keep grinding!
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289
4 speed
Rally-Pac
Bench Seat
Power Steering
All-around discs
Aftermarket A/C

And not nearly enough time

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post #10 of 30 (permalink) Unread 06-21-2019, 03:23 PM
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Originally Posted by alex1965 View Post
Wow, your dedication to modifying a 50+ year old car is admirable. Keep grinding!
I second this. I like hiding modern stuff in plain sight, too. Given the limited space in a Mustang's body, this is also cool as we age and may not have the oomph we used to for stomping p-brake pedals or twisting and pulling handles but I hope I am able to use the old-school backups a long time.

'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories
•Original Styled Steel Wheels
...my first car

'66 Emberglo / Parchment coupe
•289 / 2100 •C4 Auto •Disc Brakes
•Dual Exhaust •16:1 Power Steering
•Dealer Air Conditioning •Console
...son's first car


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post #11 of 30 (permalink) Unread 06-21-2019, 03:23 PM Thread Starter
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Here is the information on how an electric parking brake works.
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post #12 of 30 (permalink) Unread 06-21-2019, 04:55 PM
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Cooooool....
How my current parking brake works fits in an area about the size of my cell phone screen.. with pictures ! Haha! ! I'm glad you have the patience and wherewithal for it. Hey, I did do an LED head, park/turn, and tail light conversion, electronic ignition, LED instrument bulbs and I'm thinking about hiding a quiet late-model thermostatically-controlled electric cooling fan for this 105-degree weather. Do you have suggestions for the quietest / best pusher fan I can put in with an off-auto-on configuration? At one time I heard people raved about some Ford Taurus 3.8 fan or something. I've also heard of Spal etc.
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post #13 of 30 (permalink) Unread 06-21-2019, 10:42 PM Thread Starter
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So this is what I did today. I went through a few hundred pages of wiring diagrams to get to this point but the stop switch interfaces with yet another control module. Im going to look into how to bypass it. Any ecm masters?
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post #14 of 30 (permalink) Unread 06-22-2019, 09:13 AM
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I wasnt criticizing the work by any means...but to say a conventional "parking" brake wont help you stop the car in an emergency is just silly. Of course it does....that's why it's a gradual pull and not just an electrical solenoid that shoots a pin into a rotor or something. Electric brakes(and pneumatic for that matter) work either one of two ways...either the default is engaged, or disengaged. In the case of engaged, your vehicle isnt going anywhere in case of power failure(not so bad on the road unless your alternator fails at the same time...then its catastrophic) but if its parked...that means you are unable to even tow the vehicle without dragging it up onto a flatbed, killing tires. In the case of default disengaged...there is no catastrophic failure on the road unless your hydraulic brakes fail at the same time....but parked...disengaged can roll you down a hill, destroying your vehicle and possibly hurting or killing other people if you live some place with crazy hills like San Francisco.
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post #15 of 30 (permalink) Unread 06-22-2019, 11:07 AM
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^^^ I can't say I've ever heard of that unless it was a manual trans somebody left out of gear and didn't set a brake. I suppose if the default was engaged and a disabled vehicle lost power, a jump box or cables from a tow rig would at least be able to remedy that temporarily. OP has their hands full with this electrical project, and as cool as modern stuff can be, this is EXACTLY why I drive an old car and an old(ish) truck. I need a break from the complexity of life and I can work on those if I need to. Good luck krynn44!!
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