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| Dual Circuit Master Cylinder, Now with Smashed Reservoir p2 https://ausmini.com/forums/viewtopic.php?f=5&t=7949 |
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| Author: | minstar [ Thu Jun 09, 2005 1:24 pm ] |
| Post subject: | Dual Circuit Master Cylinder, Now with Smashed Reservoir p2 |
Hi guys, I am about to put my dual circuit mastercylinder in and was wondering if there is a sequence for the brakes lines. That is, does the front line go in the bottom hole and the rear line in the top or vice versa or does it not matter. I assume that given it was designed as a fail safe that there would be a specific sequence. I hope to put it in tonight so if any body knows... Cheers |
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| Author: | 9YaTaH [ Thu Jun 09, 2005 1:27 pm ] |
| Post subject: | Re: Dual Circuit Master Cylinder |
minstar wrote: Hi guys, I am about to put my dual circuit mastercylinder in and was wondering if there is a sequence for the brakes lines. That is, does the front line go in the bottom hole and the rear line in the top or vice versa or does it not matter. I assume that given it was designed as a fail safe that there would be a specific sequence. I hope to put it in tonight so if any body knows...
Cheers Anto is in Hawker and he has a whole Library of Technical Manuals  
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| Author: | Anto [ Thu Jun 09, 2005 1:36 pm ] |
| Post subject: | |
I believe the top pipe goes to the rear brakes and the bottom go to the front - and they both go through the pressure limiting valve, which works for both front and back. The limiting valve is more important - get that one round the right way! Probably should have it double checked though since its brakes and they're mildly important. |
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| Author: | minstar [ Thu Jun 09, 2005 1:51 pm ] |
| Post subject: | |
Hey what Anto? Pressure Limiting Valve? I was just going to plug em in. Damn it another thing I have to collect? |
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| Author: | Anto [ Thu Jun 09, 2005 2:00 pm ] |
| Post subject: | |
Is your car originally fitted with dual circuit brakes or is this an engineering requirement? The pressure limiting valve sits on the firewall near the master cylinder, cylindrical looking thing, has the two inputs for front and rear, and one output for rear and two outputs for front. I hope you have one coz their very expensive ! |
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| Author: | minstar [ Thu Jun 09, 2005 2:08 pm ] |
| Post subject: | |
Is it really necessary? |
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| Author: | miniVan [ Thu Jun 09, 2005 2:09 pm ] |
| Post subject: | |
dual circuit brakes are not designed for front/back you need a limiting valve suitable for dual circuit what the dual circuit is for is if the master blows, only half the master lets go and the other half still works, the limiting valve usually has a brake fail switch in it to let you know when this happens. then the limiting valve will ditribute the load evenly front rear (both go into brake bias valve with brake fail indicator) its a safetly thing not a power thing, i had one half let go in my beetle.. brakes were diminished but not gone, there a life saver |
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| Author: | Anto [ Thu Jun 09, 2005 2:17 pm ] |
| Post subject: | |
miniVan wrote: dual circuit brakes are not designed for front/back
you need a limiting valve suitable for dual circuit what the dual circuit is for is if the master blows, only half the master lets go and the other half still works, the limiting valve usually has a brake fail switch in it to let you know when this happens. then the limiting valve will ditribute the load evenly front rear (both go into brake bias valve with brake fail indicator) its a safetly thing not a power thing, i had one half let go in my beetle.. brakes were diminished but not gone, there a life saver I was under the impression that the Mini dual circuit brakes were a bit more simplistic than that - they split the system front and rear, and if the master cylinder gives out, or you burst a brake line etc, you at least have half the brakes still working (ie front or rear). Matt, you do need the pressure limiting valve, especially if you want to please your engineer. |
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| Author: | minstar [ Thu Jun 09, 2005 2:24 pm ] |
| Post subject: | |
Anto what's the damage? Anyone want to save Team Matty Starlet and give me one for free? 
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| Author: | minstar [ Thu Jun 09, 2005 3:23 pm ] |
| Post subject: | |
Will they not work at all without the limiting valve or the limiting valve removes the safety factor. |
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| Author: | 13secmini [ Thu Jun 09, 2005 3:56 pm ] |
| Post subject: | |
matt i dont have the limiting valve on mine as it is not needed. I can also say that if one line blows you will not get any pressure in the other line, maybe as i dont have that valve fitted im not sure... |
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| Author: | Anto [ Thu Jun 09, 2005 4:00 pm ] |
| Post subject: | |
If you're converting a single system to tandem, then you don't technically need it if you retain the original limiting valve on the rear subframe, which will stop your rear wheels locking up. It is a good idea to use the proper twin-circuit limiting valve, I'd wager it's there for a reason. If you have no limiting valve at all, then that's bad. |
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| Author: | minstar [ Thu Jun 09, 2005 4:21 pm ] |
| Post subject: | |
Yeah I have the one at the back. Thanks all and one for their comments I think to get over the line I am going to give the front limiting valve a miss as I was driving the car without tandem brakes for decades. Maybe when I become infinitely wealthy. Also I was looking at the Minimania site (american version) and they had a dual circuit mc that looks suspiciously like mine (and yours Brad) that had the limiting valve built in? Or so they say. Also just to clarifiy REAR BRAKE LINE IN THE TOP HOLE, correct? Sorry to shout. Cheers and thanks for the advice. |
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| Author: | drmini in aust [ Thu Jun 09, 2005 4:23 pm ] |
| Post subject: | |
I just overhauled Barney's- yes the rear connects to top fitting.
But as both sections of the Clubbie tandem MC are the same bore it probably doesn't matter a rat's really. 
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| Author: | minstar [ Thu Jun 09, 2005 4:25 pm ] |
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Thanks doc, well getting things done now. Brakes tonight clutch tomorrow, missle guidance system Saturday... |
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