To: Volvo303@yahoogroups.com From: "wbmayberry" Date: Thu, 11 Sep 2003 19:40:04 -0000 Subject: [Volvo303] Valve / Solenoid identification Reply-To: Volvo303@yahoogroups.com Howdy, On my C304, there is a electrical valve or solenoid in the passenger=20 compartment bulkhead behind the front right seat, just above the=20 passenger compartment heater. I notice it engages (loud click)=20 whenever I brake.=20=20 Can anyone tell me what is it, and where I might find a 12V one to=20 replace it when I convert my truck? Thanks, Will To: Volvo303@yahoogroups.com From: "Howie Oakes" Date: Thu, 11 Sep 2003 21:03:10 -0000 Subject: [Volvo303] Re: Valve / Solenoid identification Reply-To: Volvo303@yahoogroups.com --- In Volvo303@yahoogroups.com, "wbmayberry" wrote: > Howdy, > > On my C304, there is a electrical valve or solenoid in the passenger > compartment bulkhead behind the front right seat, just above the > passenger compartment heater. I notice it engages (loud click)0 > whenever I brake. > > Can anyone tell me what is it, and where I might find a 12V one to > replace it when I convert my truck? > > Thanks, > > Will Hi Will- I am no volvo expert, but have been looking at them for a while... Could that be the solenoid that auto engages the 4wd when you brake=20 hard? I believe the 303s had this as a safety measure... -Howie To: From: "John Allen" Date: Fri, 12 Sep 2003 08:07:00 +1000 Subject: RE: [Volvo303] Valve / Solenoid identification Reply-To: Volvo303@yahoogroups.com -----Original Message----- From: wbmayberry [mailto:wbmayberry@yahoo.com] Sent: Friday, 12 September 2003 5:40 AM > Howdy, > > On my C304, there is a electrical valve or solenoid in the passenger > compartment bulkhead behind the front right seat, just above the > passenger compartment heater. I notice it engages (loud click)0 > whenever I brake. > > Can anyone tell me what is it, and where I might find a 12V one to > replace it when I convert my truck? > > Thanks, > > Will This is the 4wd engaugement valve. Volvo also made some vehicled in 12volt - try volvo for it. There is a pressure switch under the dash on the brake line that activates 4wd when the brakes are applied hard. (antilock brakes!). If the brakes are not working properly (eg cylinders seized on one circuit), the brakes will still operate but more pedal pressure isi needed which results in premature activation of this feature - regular engaugement in normal driving with the result that the vehicle gets wound up in 4wd if the brakes are used upon entry to corners such as roundabouts. If the brakes are working properly, activation of this feature should not be a regular occurance with normal driving. Note that the same soleniod is used for all the 4wd engaugement actions. I have put a filter (not small) on the vent from the soleniod to keep the system clean. John Allen To: Volvo303@yahoogroups.com From: "wbmayberry" Date: Fri, 12 Sep 2003 14:09:35 -0000 Subject: [Volvo303] Re: Valve / Solenoid identification Reply-To: Volvo303@yahoogroups.com > This is the 4wd engaugement valve. Volvo also made some vehicled in > 12volt - try volvo for it. > > There is a pressure switch under the dash on the brake line that > activates 4wd when the brakes are applied hard. (antilock brakes!). > > If the brakes are not working properly (eg cylinders seized on one > circut), the brakes will still operate but more pedal pressure isi > needed which results in premature activation of this feature - > regular engaugement in normal driving with the result that the vehicle > gets wound up in 4wd if the brakes are used upon entry to corners such > as roundabouts. > > If the brakes are working properly, activation of this feature should > not be a regular occurance with normal driving. > > Note that the same soleniod is used for all the 4wd engaugement > actions. > > I have put a filter (not small) on the vent from the soleniod to keep > the system clean. > > > John Allen Thanks John, I got under the dash board and one of the two brake fluid reservoirs=20 is empty. That could be why it keeps engaging. Does the truck use=20 DOT 3 brake fluid? Thanks for the info, Will PS My truck came with an old bullet hole in the rear compartment=20 (been painted over a couple times), which I found amusing. When I=20 pulled of the dash cover, there was a live bullet laying on one of=20 the flat spots. To: pinzgauer@yahoogroups.com From: "Willem-Jan Markerink" Date: Sun, 25 Jan 2004 07:26:28 +0100 Subject: [pinzgauer] Hard braking performance (was: Newbie questions Reply-To: pinzgauer@yahoogroups.com On 25 Jan 2004 at 5:12, Jim Cambron wrote: > aa: > > Pretty much a "ditto" from me concerning all the other posts. > > Over the past year, I have done one or two emergency stops on the > Interstate. > > Basically, it scared the living $H!T out of me! > > Perhaps with a substantial load in the back, I would only experiece > incredibly long stopping distances instead of nearly total loss of > traction as the axles pivot downward causing the tire footprint to all > but disappear... AND incredibly long stopping distances. Is this also aggrevated by a locking up rear axle? The Volvo C30x have the rare & nifty feature of locking the drivetrain in 4wd under hard braking....to prevent the rear from locking up.... I believe the Pinz 710/712 still has mechanical 4wd-engagement, only the 716/718 uses vacuum (or pressure?), so you can't create something nifty afterwards on a 710/712, sadly....but perhaps I am wrong....:)) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand [note: 'a-one' & 'en-el'!] To: From: "Alan Barrow" Date: Mon, 26 Jan 2004 18:16:40 -0500 Subject: [pinzgauer] Not quite so simple (was Volvo VS Pinz) Reply-To: pinzgauer@yahoogroups.com OK, here we go again, you'll get a wide variance on this subject. When I first started my decision in '99 I thought I wanted the Volvo. After some research, I ended up with a pinz. Some of that had to do with availability, but some of the decision points are still valid in my mind. I'd love to have both, but I can't, and I'll keep the pinz. To some of your specific points: . . . > OH yah and if you have to brake hard at high speeds. Volvo wins again. I don't have direct experience here. We've discussed pinz performance at length recently. I will say that if it was a huge deal you could spend the bucks and convert a pinz to the TD hubs and brakes. Might be a wash with the higher selling price of the volvo's for the same condition. I might try yanking the 4wd lever during my next panic stop, it's a great idea someone mentioned! Have fun! Alan To: pinzgauer@yahoogroups.com From: "Dave Duff" Date: Tue, 27 Jan 2004 20:11:49 -0000 Subject: [pinzgauer] panic stop in 4WD Reply-To: pinzgauer@yahoogroups.com > I might try yanking the 4wd lever during my next panic stop, > it's a great idea someone mentioned! > Alan, Funny you should should suggest this! I tried it last night. One "panic stop" from 90 on wet pavement - AAHHHH! rear wheels locked up and tried to pass me! Then I put it in 4WD and tried it again. World of difference. I'd call it the poor man's ABS. Of course, this info may not be much use. I don't make a habit of driving in 4WD, and grabbing the lever during a panic stop would take reflexes I don't currently have. Probably a good trick to practice this sort of thing before you really need it. With my luck I'd train up to it, switch cars, make a panic stop and grab the hand brake lever! Regards, Dave '72 710M '75 TGB11 (but I'm not weighing in on the Pinz/Volvo comparison - the Volvo's still in CO and I've only driven it for about 15 minutes) To: pinzgauer@yahoogroups.com From: "Jim Mettler" Date: Wed, 28 Jan 2004 05:56:37 -0000 Subject: [pinzgauer] Re: panic stop in 4WD Reply-To: pinzgauer@yahoogroups.com --- In pinzgauer@yahoogroups.com, "Dave Duff" wrote: > Alan, Funny you should should suggest this! I tried it last night. > One "panic stop" from 90 on wet pavement - AAHHHH! rear wheels > locked up and tried to pass me! Then I put it in 4WD and tried it > again. World of difference. I'd call it the poor man's ABS. > > Of course, this info may not be much use. I don't make a habit of > driving in 4WD, and grabbing the lever during a panic stop would > take reflexes I don't currently have. Probably a good trick to > practice this sort of thing before you really need it. With my luck > I'd train up to it, switch cars, make a panic stop and grab the hand > brake lever! My normal driver is a '94 Jeep Cherokee with the basic "part time" 4WD system and I engage it regularly -- As Dave says, it is the poor man's ABS. Slippery, snowy, just wet, even dry pavement when traffic is crazy -- it just feels better to know that I can't lock the rear axle without locking the front too, and when they do they do it at the same time. I did some experiments and rough calculations which show that the tires can absorb about 1% speed difference which translates into 1/2 a turn of the steering wheel on pavement: this gives about a 2% difference in speed between the front axle and the back in a gentle turn (forces the fronts to go 1% slower than they want, and the back to go 1% faster than they should). In other words I do this on the freeways where turns are gradual and the speed (and danger!) is high, and not where I have to make sharper turns. After 200,000 plus miles I have honestly driven hundreds (maybe thousands) of miles on pavement in 4WD with no adverse wear on the drivetrain. But in contrast, you can't hardly breathe on the steering wheel to exceed a 2% difference between the right and left wheels with the diff locked. I've never been in a "panic stop" situation where any difference in traction left to right would have benefited from a locked diff (I've had an ARB airlocker in the Jeep for 7 years also). Engage the front axle for 4WD, yes; use the diff locks, never. I don't make a "habit" of driving around in 4WD, but I do if the conditions warrant it (and I won't violate my 1/2 turn of the wheel from straight ahead). It really does work. Jim Mettler 1976 712W