The rear brake cylinders are from Mk1 / Mk2 Fiesta Possible sizes are:
Mk1 Fiesta: 15 mm 17.5 mm 19 mm Mk2 Fiesta 15 mm 17.5 mm 20.6 mm The bigger sizes are for the XR2 The actual size Quantum recommended changed and it was also different depending on if you fitted the rear bias / inertia valves to limit the rear brake pressure. The problem is the rear of the 2+2 is a lot lighter than the rear of a Mk1 or Mk2 Fiesta and the rear wheels can lock under heavy braking which isn’t a good thing. I seem to remember i was asked when i bought my kit what my car spec was and if i was using the rear bias valves and Quantum supplied the correct size. If you’ve had no problems with the rear brakes then i would refit whatever size is on there. If you take the drum off and pull the rubber back you should be able to measure the bore dia with some calipers without having the remove anything else. If you have a gas torch or hot air gun then get the engine hot, drain some of the coolant off (carefully) and then heat the switch as much as you can. This may free it off. Otherwise, you will have to fit one in the top hose, you can buy adaptors from the kit car parts suppliers, a tube with a boss in to take a switch. If you manage to get the switch out or fit a different one then make sure you replace the connector. As soon as the connector or switch contacts overheat they damage the other half, replacing the switch with a overheated connector will just result in the connection overheating again and needing another new switch. Ideally the fan should be switched via a relay. Interestingly while sorting out a early Mk1 Fiesta loom for 003 i found there was a factory fitted relay on the fan, something they must have dropped later to save a few pennys. Jim From: 'Jamest142' via Quantum Owners Group Sent: Monday, April 6, 2020 1:42 PM To: Quantum Owners Group Subject: [Quantum Owners] Quantum 2+2 Brakes advise please (and fan switch!) Hiya folks I am after some advise please? I am looking to change the rear brake cylinders on Q2-002 as I have a very minor weep issue, I have read both the build manuals, and both state that these are not standard Fiesta parts. The late build manual says 'change the rear wheel cylinders to the correct size, new ones are supplied in the kit', and the original build manual says '17.5mm for Vented Front discs, and 15mm for solid front discs, this is not the same on any other Fiesta'... Does anyone know of the correct parts please, and also are Ferrodo still the brake shoe brand of choice, or is there anything more suitable? Also I may change the front discs / pads as I am not going anywhere fast (pun intended!), is there anything to look out for on these in terms of brand etc? Finally - the fan control switch has failed, I have a new one to fit, but no amount of socket work will shift it, and I am heading for causing damage - any recommendations for where and how to fit an new switch to the cooling system, or should i just fit a manual switch on the dashboard? Hope you are all keeping safe, and best regards James T Q2-002 www.bostin.photography -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/0b8c7d45-c09b-48f7-b155-97120899008a%40googlegroups.com. -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/1D09E9402EB94EE2B3843E42C00C8DBC%40JimQuad.
