PeteH Posted February 1, 2021 Report Share Posted February 1, 2021 Increasing the Dia of the M/Cyl. Reduces the mechanical advantage. Unless the same Factor is introduced to the Slave(s). (Pascal) By My calculation (5/8" to 0.7") About 16% reduction. Requiring extra Pedal Pressure?. Pete Link to comment Share on other sites More sharing options...
NonMember Posted February 1, 2021 Report Share Posted February 1, 2021 12 minutes ago, PeteH said: By My calculation (5/8" to 0.7") About 16% reduction 5/8" to 0.7" is 0.625/0.7 by bore, which needs squaring to get area, giving 0.797, so a 20% reduction by my reckoning. 5/8" to 3/4" is 5/6 by bore, or 25/36 by area, or a 30% reduction. Either way, the corresponding increase in required pedal pressure is substantially less than the gain of a servo. 1 Link to comment Share on other sites More sharing options...
dougbgt6 Posted February 1, 2021 Report Share Posted February 1, 2021 UK, This is from our old friends at Buckeye Triumphs a car club based in Ohio. It's about as comprehensive investigation of brake fluid as you'll find. Their stuff on Strombergs is also worth a look. Selecting+Brake+Fluid.pdf (squarespace.com) Doug Link to comment Share on other sites More sharing options...
PeteH Posted February 1, 2021 Report Share Posted February 1, 2021 19 minutes ago, NonMember said: 5/8" to 0.7" is 0.625/0.7 by bore, which needs squaring to get area, giving 0.797, so a 20% reduction by my reckoning. 5/8" to 3/4" is 5/6 by bore, or 25/36 by area, or a 30% reduction. Either way, the corresponding increase in required pedal pressure is substantially less than the gain of a servo. With O/E M/C`s over £100. And AMG ones at 1/2 that price. It`s tempting to go for it. And add the servo?. When I`ve finished cleaning up the Very grotty originals I`ll look at it Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 1, 2021 Report Share Posted February 1, 2021 not a lot of room for big feet but one very cheap way to add feel is to weld on a much larger pedal pad makes an amazing upgrade for peanuts Pete Link to comment Share on other sites More sharing options...
dougbgt6 Posted February 1, 2021 Report Share Posted February 1, 2021 I have wide feet and have to be careful which shoes I wear in the GT6 else I get the dread brake accelerator combo. And of course stage one tuning on a Triumph is to remove the accelerator stop from the pedal. Doug Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 1, 2021 Report Share Posted February 1, 2021 hello Bigfoot pete Link to comment Share on other sites More sharing options...
dougbgt6 Posted February 1, 2021 Report Share Posted February 1, 2021 I am indeed a Hobbit from the Shire db Link to comment Share on other sites More sharing options...
rlubikey Posted February 1, 2021 Report Share Posted February 1, 2021 Silicone brake fluid is based on silicone oil. Silicone oil - I was surprised to find - is NOT compatible with silicon rubber! So it's POSSIBLE that they've used silicone rubber seals. However, I agree it's much more likely that they simply haven't tested DOT-5 silicone brake fluid and they won't warrant something they haven't tested. When you work in electrochemistry you start to get a bit nerdy about chemical compatibility! Cheers, Richard Link to comment Share on other sites More sharing options...
thescrapman Posted February 2, 2021 Report Share Posted February 2, 2021 On 01/02/2021 at 09:14, clive said: . Did the tack laps at Spa almost 2 years ago, but I had to be brave and resist using the brakes as much as possible to prevent fade. A bigger brake setup is on the cards) Trackerjack type? Link to comment Share on other sites More sharing options...
Clive Posted February 2, 2021 Report Share Posted February 2, 2021 1 hour ago, thescrapman said: Trackerjack type? Sort of. I bought some new late escort calipers at a very good price, and they use a 240mm vented disc. I have some golf discs, which have been opened up to fit. I will make the caliper mounting and re-drill the discs at home, how hard can it be? (I have previous, I made the rear disc setup on my spitfire) Link to comment Share on other sites More sharing options...
PeteH Posted February 3, 2021 Report Share Posted February 3, 2021 I know we all try and "improve" our vehicles. I do however wonder where the line can be drawn?, over what is "too far"?. Probably more concerning would be "our" insurers attitude, to many of the more extreme modifications. Even if they are done in the principle of increasing safety?. Food for Thought?. Pete Link to comment Share on other sites More sharing options...
Clive Posted February 3, 2021 Report Share Posted February 3, 2021 22 minutes ago, PeteH said: I know we all try and "improve" our vehicles. I do however wonder where the line can be drawn?, over what is "too far"?. Probably more concerning would be "our" insurers attitude, to many of the more extreme modifications. Even if they are done in the principle of increasing safety?. Food for Thought?. Pete I have found Peter James to be very accommodating with my cars. On my toledo, they are not loading the premium despite a sprint engine being fitted as it is "in the family". Saying that it was initially a 1500 when purchased, then 1850, but never seen an increase. On the other hand, Footman James were a nightmare a few years ago, and were very unhelpful 12 years ago I insured with Peter Taylor (they included club road rallying at that time). When I got my quote, they asked about modifications. "yes, ford zetec engine and gearbox, plus uprated brakes and suspension". Their reply "that is not something we worry about" and no loading of premium. That was the year I wrote the car off, and no issues (except the underwriters being difficult about letting me have the car back, sorted by Peter Taylor) So choose your broker with care. 1 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 3, 2021 Report Share Posted February 3, 2021 5 hours ago, PeteH said: I know we all try and "improve" our vehicles. I do however wonder where the line can be drawn?, over what is "too far"? It's been argued many times... in fact the originality of our cars has been so derided by many modifiers I wonder why we're not all dead many times over. Link to comment Share on other sites More sharing options...
PeteH Posted February 3, 2021 Report Share Posted February 3, 2021 Well. I gave the old M/C a further bout of cleaning, not happy with the results as it looks as if the Bottom of the cylinder is badly wasted, (where I assume the Lower seal sits?). Connected the Endoscope to the laptop, and took a closer look:- (Snapshot). Not looking at all well. I think new is in order?. Now its choices time. O/E at £102-00?, Or up the ante, and replace with (cheaper) 0.7" device at half the price?, which would also cover the cost of a Servo?, and still come in at under £100? Total?. Hmmmmm?. Next job is to clean and check the Clutch M/C. Pete Link to comment Share on other sites More sharing options...
PeteH Posted February 3, 2021 Report Share Posted February 3, 2021 5 hours ago, clive said: (except the underwriters being difficult about letting me have the car back, sorted by Peter Taylor) When the "lady" wrote my Fiat off taking out the Door and Wing, ("Not economically viable repair") In Morrisons car park. The then insurers where non plussed when I ask to buy the salvage. 2 weeks later, second hand door and wing and a new MOT. It was back on the road. Doing my bit for the planet?.🤣 by re-cycling?. Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 3, 2021 Report Share Posted February 3, 2021 non orig but similar are a lot less than half eg https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311&_nkw=triumph+herald+brake+master+cylinder&_sacat=0&LH_TitleDesc=0&gclid=EAIaIQobChMI1K2Vr_TN7gIVAe_tCh1gIQMwEAAYASAAEgK3BPD_BwE&matchtype=e&adgroupid=107708331009&geo_id=32251&MT_ID=584406&cmpgn=10632102674&crlp=450995500691_&keyword=ay+co+uk&rlsatarget=kwd-929623632651&abcId=1140136&loc=9046046&sitelnk=&norover=1&mkrid=710-154084-937780-5&network=g&poi=&mkevt=1&adpos=&mktype=&_odkw=Ay+Co+Uk&device=c&mkcid=2 1 Link to comment Share on other sites More sharing options...
PeteH Posted February 3, 2021 Report Share Posted February 3, 2021 19 minutes ago, Pete Lewis said: non orig but similar are a lot less than half eg https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311&_nkw=triumph+herald+brake+master+cylinder&_sacat=0&LH_TitleDesc=0&gclid=EAIaIQobChMI1K2Vr_TN7gIVAe_tCh1gIQMwEAAYASAAEgK3BPD_BwE&matchtype=e&adgroupid=107708331009&geo_id=32251&MT_ID=584406&cmpgn=10632102674&crlp=450995500691_&keyword=ay+co+uk&rlsatarget=kwd-929623632651&abcId=1140136&loc=9046046&sitelnk=&norover=1&mkrid=710-154084-937780-5&network=g&poi=&mkevt=1&adpos=&mktype=&_odkw=Ay+Co+Uk&device=c&mkcid=2 Been Looking at some of these. There is one which is 5/8". BUT the seller stated for "Front DRUMS". Any idea why that should be?. Different stroke?. (It looks identical to O/E) The other(s) appear to be 3/4". Which to my mind would necessitate of increased Pedal pressure?. (OK, I know that could be offset with a servo). Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 3, 2021 Report Share Posted February 3, 2021 24 minutes ago, PeteH said: When the "lady" wrote my Fiat off taking out the Door and Wing, ("Not economically viable repair") In Morrisons car park. The then insurers where non plussed when I ask to buy the salvage. 2 weeks later, second hand door and wing and a new MOT. It was back on the road. Doing my bit for the planet?.🤣 by re-cycling?. Pete That's how the accident repair places make most of their money; charging Insurance Companies massively inflated prices to repair cars. My daughter's 107 was written off, not because of minor damage to the front bumper, but because the airbags had deployed and the cost of a brand new bumper and a brand new dashboard, with airbags, was too great. The new buyer fitted a second-hand dash and a replacement front bumper from a scrapped 107 and it's still on the road not far from us. Accident Repair facilities don't use second-hand parts due to the risks involved, but a private buyer can, at vastly reduced cost. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted February 3, 2021 Report Share Posted February 3, 2021 3 minutes ago, PeteH said: Been Looking at some of these. There is one which is 5/8". BUT the seller stated for "Front DRUMS". Any idea why that should be?. Probably a smaller reservoir, which would not hold sufficient fluid for disc brakes. You need the MC extension, or a larger master cylinder which has the same bore but greater fluid capacity. 1 Link to comment Share on other sites More sharing options...
johny Posted February 3, 2021 Report Share Posted February 3, 2021 What about one of these at 17 pounds delivered and then get a large screw in reservoir (~10 pounds) and use your old push rod.... https://www.ebay.co.uk/itm/0-625-OEM-Clutch-Slave-Master-Cylinder-Heavy-Duty-Motor-Hydraulic-Handbrake-Part/264879949883?hash=item3dac13483b:g:BAEAAOSwiydfcaq- Link to comment Share on other sites More sharing options...
PeteH Posted February 3, 2021 Report Share Posted February 3, 2021 47 minutes ago, Colin Lindsay said: Probably a smaller reservoir, which would not hold sufficient fluid for disc brakes. You need the MC extension, or a larger master cylinder which has the same bore but greater fluid capacity. Something like this then?. https://www.jamespaddock.co.uk/brake-master-cylinder-single-line-2 Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 3, 2021 Report Share Posted February 3, 2021 thats what we used on the Vit6 way back as you say just use your existing pushrod the fact the res is upright ,not angled just means you dont brim the level nice and easy to see the levels and holds a LOT more fluid in reserve Pete 1 Link to comment Share on other sites More sharing options...
thescrapman Posted February 3, 2021 Report Share Posted February 3, 2021 13 hours ago, PeteH said: I know we all try and "improve" our vehicles. I do however wonder where the line can be drawn?, over what is "too far"?. Probably more concerning would be "our" insurers attitude, to many of the more extreme modifications. Even if they are done in the principle of increasing safety?. Food for Thought?. Pete Pete, if you ever get the chance, drive a Sprint with standard brakes. Take clean underwear with you! 1 Link to comment Share on other sites More sharing options...
NonMember Posted February 3, 2021 Report Share Posted February 3, 2021 36 minutes ago, thescrapman said: Pete, if you ever get the chance, drive a Sprint with standard brakes. Try a TR7 with standard brakes! Same pads as a Mini. (Admittedly mine also had a Sprint engine and we were doing RBRR in convoy with a shockingly unreliable other TR7 Sprint, so the dismal brakes got a thorough wear work out.) Link to comment Share on other sites More sharing options...
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