Trod8812 Posted September 6, 2016 Report Share Posted September 6, 2016 I have a 1979 Datsun 620 and it currently has 3 inch lowering blocks, ride quality is complete shit and I want to go back to stock height or just below so I can actually haul some weight without bottoming out or having the bed rub the tries. I want to know what parts I will need to accomplish this. 1 Quote Link to comment
flatcat19 Posted September 6, 2016 Report Share Posted September 6, 2016 Stock sized u-bolts. An some tools. 1 Quote Link to comment
Trod8812 Posted September 6, 2016 Author Report Share Posted September 6, 2016 What size are the stock size? Quote Link to comment
flatcat19 Posted September 7, 2016 Report Share Posted September 7, 2016 They're the same size as the ones you have on there...just 3" shorter. Quote Link to comment
datzenmike Posted September 7, 2016 Report Share Posted September 7, 2016 Measure the length of the drop block thickness and subtract from the U bolts on it. 1 Quote Link to comment
Trod8812 Posted September 7, 2016 Author Report Share Posted September 7, 2016 Thanks for the information, another question I have is, when I step on the break pedal the first time it goes about half way to the floor and if I let off and imidiatly press it again I have a substantially more stopping power and the pedal does not go as far, what could cause that. And when I have a little bit of weight in the truck and press the brakes it pulls to the left but is fine when no weight is it the bed. Quote Link to comment
hobospyder Posted September 7, 2016 Report Share Posted September 7, 2016 Double pump datsun brakes is what I've heard a lot. Helps build up pressure I think Quote Link to comment
flatcat19 Posted September 7, 2016 Report Share Posted September 7, 2016 Brakes need to be adjusted. That's assuming that the pedal stays firm on the second pump without it falling. 1 Quote Link to comment
Trod8812 Posted September 7, 2016 Author Report Share Posted September 7, 2016 Yes it stays firm Quote Link to comment
flatcat19 Posted September 7, 2016 Report Share Posted September 7, 2016 Shoes are too far away from drums when you initially push pedal. That's why the second pump is quicker and firmer-your first pump got them closer. Make sense? Lots of threads about proper brake drum adjustment around here. 1 Quote Link to comment
Trod8812 Posted September 8, 2016 Author Report Share Posted September 8, 2016 What about my truck pulling to one side when applying the brakes? Would that be the slide pins? Quote Link to comment
sebpv Posted September 8, 2016 Report Share Posted September 8, 2016 Trod I suppose you have pads on both sides of the rotor? Do the pads have lots of mileage on them? If so you can tell the slide pins are bad by comparing boths pads on one side. If one wears out more, its likely that the pins are dry and dont let the caliper slide and make more pressure on the piston side. Quote Link to comment
sebpv Posted September 8, 2016 Report Share Posted September 8, 2016 A bad wheel bearing is another cause of pulling with brakes on 1 Quote Link to comment
bilzbobaggins Posted September 8, 2016 Report Share Posted September 8, 2016 Bad ball joint, other worn out front end components, air in system Quote Link to comment
datsunaholic Posted September 8, 2016 Report Share Posted September 8, 2016 Double pumping usually is the brake adjustment. The rear brakes on this are drums- they do NOT have self-adjusters, so must be manually adjusted all the time (not as often as ones with front drums, but still). If one is WAY out of adjustment, it won't be doing and work, but will cause excessive pedal travel and pulling to the opposite side. Usually the rear adjusters freeze up due to no one adjusting them regularly. Hell, I adjust mine every other oil change and mine still froze and I had to pull the drum and partially pull the shoes to free up the adjuster (which involved a vice, a pair of channel locks, and a propane torch). Pulling could also be the disc fronts, of course, so they need to be inspected. If they're wearing uneven, it could be air in the lines or a bad caliper on one side. Most of your stopping is done in the front. 1 Quote Link to comment
Trod8812 Posted September 8, 2016 Author Report Share Posted September 8, 2016 I've noticed the left front caliper will lock before any other pad or shoe does. Quote Link to comment
flatcat19 Posted September 8, 2016 Report Share Posted September 8, 2016 Maybe your LF caliper is the only one working. Where in Washington are you located? Quote Link to comment
Trod8812 Posted September 8, 2016 Author Report Share Posted September 8, 2016 Renton 1 Quote Link to comment
datzenmike Posted September 9, 2016 Report Share Posted September 9, 2016 Check also your tension rod bushings. If really bad that front wheel will tend to move to the rear when the brakes are applied and the steering alignment will be affected until you release the brakes. 1 Quote Link to comment
Trod8812 Posted September 9, 2016 Author Report Share Posted September 9, 2016 The only other weird thing is that when I apply the brakes the direction it pulls will change from left to right, what I mean is, when I alloy the brakes it will pull hard to the left, then after driving a little ways I apply the brakes again and it will either hold straight or pull slightly to the right. Quote Link to comment
banzai510(hainz) Posted September 9, 2016 Report Share Posted September 9, 2016 I would ck the bushings also. in front suspention. Upper and the tension rod ones. pull the drum and see if leaky or dirty brakes. I just pull the wheel bearing and take it off that way as its FAST 1 Quote Link to comment
Trod8812 Posted September 9, 2016 Author Report Share Posted September 9, 2016 No of this started until I put heavier 15 inch rims on the truck 1 Quote Link to comment
banzai510(hainz) Posted September 9, 2016 Report Share Posted September 9, 2016 well when I put bigger 15rims on my 1st 510 I had soem of the same issues. I would redo the brakes new pads and disc if 79 have disc. If you havent already to raise truck back to stock is find the old U bolts. then just remove the blocks and reinstall. the fronts you can just screw the torsion nut back up and should raise it to a better level 1 Quote Link to comment
datzenmike Posted September 9, 2016 Report Share Posted September 9, 2016 When ever you have a sudden problem, ask yourself... What did I do to the truck lately? What have I adjusted or replaced recently? Do you have all radials? or mix of bias ply and nylons on it??? Check lug nuts tight Check air pressure Move fronts to back and see what.... 1 Quote Link to comment
Trod8812 Posted September 10, 2016 Author Report Share Posted September 10, 2016 what could cause it to switch which side it pulls to while braking? 1 Quote Link to comment
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