Drewdog
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Mk2 Escort brake proportioning valve
Hello all does anyone know which way around the proportioning valve goes? Does the bolt face the firewall or front of car? It's the one under the brake booster....
Sounds like a dumb question but its been an age since I took it off and can't find a pic of it in any of my manuals.....
Cheers Drew..........
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Flighter
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Re: Mk2 Escort brake proportioning valve
2015/04/18 14:18:32
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Drewdog
Hello all does anyone know which way around the proportioning valve goes? Does the bolt face the firewall or front of car? It's the one under the brake booster....
Sounds like a dumb question but its been an age since I took it off and can't find a pic of it in any of my manuals.....
Cheers Drew..........
Here's a truly miserable photo of it (cropped from a larger one), which is the best I've got I'm afraid. Hopefully it will help.
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Drewdog
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Re: Mk2 Escort brake proportioning valve
2015/04/18 15:05:29
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Thanks Rob, heading back out to put it in now.......
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NQRS
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Re: Mk2 Escort brake proportioning valve
2015/04/18 20:06:33
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Hi Drew,
Have you stripped it and replaced the seals on the shaft inside? Might be good if it hasn't been used for while. Also if you run discs on the rear the engineer who certified my conversion said to remove the valve from inside so the brake bias was 50/50, rather than 60/40 for those with rear drum brakes.
Cheers,
Len
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RS 2000
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Re: Mk2 Escort brake proportioning valve
2015/04/18 23:52:34
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NQRS
Also if you run discs on the rear the engineer who certified my conversion said to remove the valve from inside so the brake bias was 50/50, rather than 60/40 for those with rear drum brakes.
Cheers,
Len
Not good advice at all. Bias has got nothing to do with type of brakes. If a particular car needs 60/40 bias, that's what it needs regardless wether its drum or disk. Bias required varies from car to car but typically rwd cars are 60-70/40-30 and fwd cars 70-80/30-20 bias. 50/50 bias will induce too much rear lock up. My rs is spot on at around 70/30. cheers
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camo91
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Re: Mk2 Escort brake proportioning valve
2015/04/19 08:24:14
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do you know if you can run a standard master with the big brake kit ( upc) of the front and r31 of the rear?
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Drewdog
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Re: Mk2 Escort brake proportioning valve
2015/04/19 16:09:24
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All finished now.. it's on standard brakes so the extra info isn't needed..... yeah I've had it seen too Len, Perth brake parts have been great, the only problem I've had with one of these was, ironically, the brake fail sender failing, leaking and not even setting off the brake fail light, haha, needed a change of pants after that one.........
Cheers Drew...............
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Flighter
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Re: Mk2 Escort brake proportioning valve
2015/04/19 18:36:21
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What did an overaul of the valve set you back Drew?
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NQRS
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Re: Mk2 Escort brake proportioning valve
2015/04/20 22:17:46
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Interesting take,RS2000. I didn't change my valve as the car was complete when inspected and I wasn't going to pull it apart with brake fluid going everywhere and ruining my paint. Is it because front discs are usually larger, even though drive comes from the rear?
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Philh
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Re: Mk2 Escort brake proportioning valve
2015/04/20 23:55:55
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In the Mk2 workshop manual this device is called a "differential valve assembly" and fitted with a "Pressure Warning Differential Switch".
In the Mk2 parts list up to 12/76 none was fitted then from 12/76 to 11/77 a 5 port assembly was fitted (Pt. No 73EB 2K493 CA) and from 11/77 a 4 port assembly (Pt. No 73EB 2K493 DA).
I believe the only purpose of the device is to light the brake fail lamp when either front or rear circuit fails.
I have not owned an Escort for some time but if I remember correctly on the later Mk2's the right front brake was fed directly from the master cylinder and the left front fed via the differential valve assembly.
I also remember asking at the parts counter about a repair kit and being told it is not a serviced part.
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ratta tat tat
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Re: Mk2 Escort brake proportioning valve
2016/09/06 13:41:36
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Philh
In the Mk2 workshop manual this device is called a "differential valve assembly" and fitted with a "Pressure Warning Differential Switch".
In the Mk2 parts list up to 12/76 none was fitted then from 12/76 to 11/77 a 5 port assembly was fitted (Pt. No 73EB 2K493 CA) and from 11/77 a 4 port assembly (Pt. No 73EB 2K493 DA).
I believe the only purpose of the device is to light the brake fail lamp when either front or rear circuit fails.
I have not owned an Escort for some time but if I remember correctly on the later Mk2's the right front brake was fed directly from the master cylinder and the left front fed via the differential valve assembly.
I also remember asking at the parts counter about a repair kit and being told it is not a serviced part.
Interesting info thanks Phil. I will be redoing the brake lines in the Denim pack soon, so the front left brake line doesn't run along the firewall where my turbo dump pipe would cook it. I'll probably route it beneath the radiator. Going by what you've said, I can delete this valve assembly without any concerns?
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ratta tat tat
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Re: Mk2 Escort brake proportioning valve
2016/09/06 13:47:00
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Pic for reference
post edited by ratta tat tat - 2016/09/06 13:50:01
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blue74
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Re: Mk2 Escort brake proportioning valve
2016/09/06 15:12:34
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The "brake fail warning light" that is controlled by this valve is required by ADR regulations so if your engineer is on the ball he will want it operational.
Ratta tat tat there is no reason why it couldn't be re positioned else ware under the bonnet as long as it is plumbed correctly.
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NQRS
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Re: Mk2 Escort brake proportioning valve
2016/09/06 17:25:53
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I pulled my valve apart and left it at my local brake specialist. They got new seals for it but don't know if it came as a kit. Len
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