Yes, it tends to make the back end overtake the front as the back end locks up. I never even considered it.
Neil On Sep 23, 6:00 am, Matthew Wastell <matt...@wastell.eu> wrote: > In such situations does the handbrake do anything? > > M > > On 21 Sep 2011, at 07:46, barnacle <nailed.barna...@gmail.com> wrote: > > > It was certainly a surprise... > > > We've done some analysis. When we built the car, Joe and I followed > > the layout of the Coupe donor as far as the ABS system and concluded > > that of the two sections of the master, one fed the front, one the > > back. However, it turns out that there is internal cross-coupling > > within the ABS block (which I didn't want to use) and that the thing > > is designed to be used diagonally crossed. > > > The master has an actuating rod which is hollow and contains a strong > > spring and a secondary push-rod; the pistons are concentric and the > > front one pushes *through* the rear one, as far as we can see. This > > means that each half can move a different amount based on how much > > fluid is moved. In the cross-coupled mode there is only a very small > > amount of differential movement since the system shifts equal volume > > apart from trivial pad wear differences. As we built it, the rear > > shoes require a much smaller displacement than the fronts, and we > > think that this excessive differential could have stressed the seals. > > It also explains why it's difficult to bleed. > > > (On the other hand, the master *is* fifteen years old...) > > > Anyway, that will be changed to diagonally coupled as soon as I'm > > outside with a spanner and it's not raining... the car won't be going > > any further until then. > > > Neil > > > p.s. I've tried engine braking on the Coupe - same engine setup, but a > > lot heavier - and it just wouldn't have stopped fast enough! > > > On Sep 20, 7:35 am, Ian Harrison <bighatp...@googlemail.com> wrote: > >> Ouch - nasty! Glad you managed to keep things under 'control'. > > >> I know from my recent master cylinder issues that these things really take > >> you by surprise as they work so well for so long, and then... > > >> Sent from my iPad > > >> On 18 Sep 2011, at 19:51, barnacle <nailed.barna...@gmail.com> wrote: > > >>> On my way in the Quantum to the Fiat Coupe owner's club AGM on > >>> Saturday, I pulled into Tibshelf services and discovered on the > >>> sliproad I had *no* brakes - pedal to the floor, pump pump pump, > >>> nothing, nada, zip. > > >>> Eeek! > > >>> Managed to get the thing slowed down on the box - a light car and a > >>> big engine has lots of engine braking, even a low compression turbo > >>> lump - and got the thing parked safely; blagged a lift to the AGM with > >>> Joe and on the return had it towed to his place where we laboured > >>> through the evening replacing the brake master cylinder. Not an easy > >>> job but easier than on the coupe, I think... finally made it home > >>> about eleven that evening. > > >>> Finding you have no brakes at sixty miles an hour and fifty metres > >>> from a right angle bend does tend to concentrate the mind... > > >>> -- > >>> 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 > >>> athttp://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 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 > > athttp://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 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).
