Read Brake Proportional Valve |
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A65Rocket
Senior Member Joined: 02 Oct 2015 Location: Stafford Status: Offline Points: 107 |
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Posted: 12 Feb 2017 at 16:56 |
I am adding a sidecar brake into rear brake circuit on my 1999 EV.
Looking at the hydraulic circuits, I think the bast place is to add a double banjo to the rear brake feed from the proportional valve. Looking at the valve, it has a strange cone section leading to the front brake feed, what is it, and can I remove it to create more space there. Attached photo shows the system. There is not much space there, so I could add it to the feed from the master cylinder. thoughts & comments. I have replaced the rear caliper with a P08 and have a small V50 caliper on the sidecar. I am not planning to replace the master cylinder unless the bore is too small, I will find this out once the system is functioning. |
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Thrash- Bang - Rebuild
V100S Mandello RX4 sidecar (gets fitted randomly) BSA A65 Rocket BSA M23 Empire Star BSA D14/4 Honda Bros 400 Can you see a BSA theme yet? |
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DavieL
Senior Member Joined: 04 May 2016 Location: Scotland Status: Offline Points: 258 |
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Im sure someone who knows will be along soon but here is my guess, this is some sort of pressure reducer so if you take it out and reconnect the front the front/rear pressure distribution will be messed up.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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That shaped part on my Spada III was some sort of brake valve for the front. It only opened when the hydraulic pressure rose above a preset level, and was designed to ensure the front brake was applied just after the rear.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Drumnagorrach
Senior Member Joined: 20 Dec 2016 Location: North east Scot Status: Offline Points: 98 |
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Earlier T3 's didn't have the proportional valve ,and in my opinion stopped a lot better.
I remember feeling the bike squat down both back and front when I gave the pedal a hard press . My 1100i doesn't stop as well . How about just take out the innards ? |
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A65Rocket
Senior Member Joined: 02 Oct 2015 Location: Stafford Status: Offline Points: 107 |
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Reading Guzziology, that makes sense.
The black block is just a manifold for the fluids. The tapered block is the pressure delay for the front, it kicks in after the back brake applies. |
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Thrash- Bang - Rebuild
V100S Mandello RX4 sidecar (gets fitted randomly) BSA A65 Rocket BSA M23 Empire Star BSA D14/4 Honda Bros 400 Can you see a BSA theme yet? |
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Drumnagorrach
Senior Member Joined: 20 Dec 2016 Location: North east Scot Status: Offline Points: 98 |
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Brian , that seems to be the wrong way round , I thought the front brake got priority ?
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A65Rocket
Senior Member Joined: 02 Oct 2015 Location: Stafford Status: Offline Points: 107 |
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One thought.
What are the groups thoughts on making your own brake items using my trusty Myford ML7 I'm thinking of a hex block of stainless steel, with a 10x1.0 hole for the front brake pipe, and a male extra thread at the other end to screw into the manifold block, this would take both the back brake pipe. My sidecar brake pipe which is an M10x1.0 male, I would drill into the side of my new hex block. Would a good M10 tap make a clean enough thread ? Opinions / comments. |
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Thrash- Bang - Rebuild
V100S Mandello RX4 sidecar (gets fitted randomly) BSA A65 Rocket BSA M23 Empire Star BSA D14/4 Honda Bros 400 Can you see a BSA theme yet? |
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Ianboydsnr
Senior Member Joined: 14 May 2014 Location: Cumbria Status: Offline Points: 831 |
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Yes you can make your own, You could also remove the pipe going to the front disc, then run that pipe outlet to the sidecar, and connect the front disc to the front master cylinder, so you have separate front and back, you probably wouldn't have to upgrade the front master but you might I wouldn't use stainless, alluminium or brass would be fine and is easier to machine, plenty of brass and alloy used in brakes. Edited by Ianboydsnr - 12 Feb 2017 at 20:14 |
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A65Rocket
Senior Member Joined: 02 Oct 2015 Location: Stafford Status: Offline Points: 107 |
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Brass is nicer to machine, also bronze is good.
I wanted to keep the linked brakes as I have used them before on sidecars and like the multi caliper braking effect. |
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Thrash- Bang - Rebuild
V100S Mandello RX4 sidecar (gets fitted randomly) BSA A65 Rocket BSA M23 Empire Star BSA D14/4 Honda Bros 400 Can you see a BSA theme yet? |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Rear brake pedal, remember - rear first, then adds front if you push harder. |
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"Chicken nuggets don't dance on a Tuesday."
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Drumnagorrach
Senior Member Joined: 20 Dec 2016 Location: North east Scot Status: Offline Points: 98 |
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Have you had a look at Demon Tweeks web site ? they have a lot of brake components for rally cars , . I seem to remember seeing adjustable proportioning valves ,as well as T pieces and make your own braided brake pipe components .
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Once the front kicks in, then the proportioning valve limits the pressure to the rear, so yes, the front does take priority. |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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