1990 Buick Electra Brake fluid not getting to left rear or

BLEEDING FRONT BRAKES The front brakes can be bled in conventional manner or by pressure bleeding. The manufacturer recommends pressure bleeding front brakes with a minimum of 20 psi (1.4 kg/cm 2 ). BLEEDING FRONT BRAKES WITH PRESSURE BLEEDER 1. Bleed front brakes only when rear brakes have been bled first. Remove reservoir cap. Attach Bleeder Adapter (J-35798) to reservoir. Attach bleeding equipment and pressurize system to 20 psi (1.4 kg/cm 2 ). 2. Attach a bleeder hose to one front bleeder valve and submerge other end of hose in a container of clean brake fluid. Open bleeder valve. 3. Allow fluid to flow until no air is seen coming out end of hose. Close bleeder valve. Repeat procedure for other front brake. Fill reservoir to maximum level with accumulator fully charged. BLEEDING REAR BRAKES Bleeding the rear brakes requires a fully charged accumulator. The manufacturer does NOT recommend bleeding rear brakes by using a pressure bleeder. Bleeding Rear Brakes With Fully Charged Accumulator 1. Turn ignition on. Allow system to become fully charged. Pump motor will stop when system is fully charged. Attach a bleeder hose to one rear bleeder valve and submerge other end of hose in a container of clean brake fluid. Open bleeder valve. 2. With ignition on, slightly depress brake pedal for at least 10 seconds. Continue procedure until there is no more air coming out of hose. Repeat procedure for other rear brake. Fill reservoir to maximum level with a fully charged accumulator. CAUTION: Care must be exercised when opening rear caliper bleeder screws, due to extremely high pressure available from a fully charged accumulator at bleeder screws.
If it's an ABS problem read the codes this way:
ABS DIAGNOSTIC CODES 1. With ignition off, ground ALDL connector (pin H), located under dash on driver's side of vehicle. Turn ignition switch to "RUN" and count "ANTI--LOCK" lamp flashes. This is the first digit of the trouble code. The lamp will pause (remain off) for 3 seconds then begin flashing the second digit of the code. If lamp turns on for 4 seconds then turns off, no trouble codes are present, return to FUNCTION CHECK. 2. Leave ignition in "RUN" position. After the first code has been displayed, record code and unground ALDL. Ground connector a second time and repeat counting flashes as in step 1). This will be the second code. Record second code and repeat step 2) until there are no more codes. 3. Repair indicated problem before clearing codes. All codes must be displayed before EBCM will clear memory. Drive vehicle above 18 MPH. Display codes and repeat step 3) until no more codes display.

Jump A to H and count the flashes,
Cross these two terminals , then turn the key on. Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 12. Write them down and post here. This connector is right under the left side of the dash...

You can try gravity bleeding, just open all bleeders, wait, when they start to drip close bleeders. This may take a while but it will work, just dont let the master run dry. Or open a rear bleeder, lets start at right rear, put your finger over the bleeder, and have someone SLOWLY depress the pedal 3/4 of the way down. Keep finger on the bleeder, now let the pedal up, wait 15 seconds, repeat this until fluid is obtained at rear, quick take up master cylinders require a wait time between pumps, and also NO pumping, just push and release. Did you bench bleed the master cylinder? All air gone when cracking the master lines?
BLEEDING HYDRAULIC BRAKE BLEEDING Hydraulic system bleeding is necessary any time air has been introduced into system. Bleed brakes at all 4 wheels if master cylinder lines have been disconnected or master cylinder has run dry. Bleeding may be done either by using pressure bleeding equipment or by manually pumping brake pedal and using bleeder tubes. BLEEDING MASTER CYLINDER 1. Depressurize ABS system (if equipped). Remove power brake reserve by applying brakes several times with the ignition off until all reserve is depleted. Ensure fluid level in master cylinder reservoir is adequate. 2. Loosen front hydraulic line(s) on master cylinder and allow fluid to fill the master cylinder until it begins to flow from the front line connector port. 3. Tighten front brake lines. Depress and hold the brake pedal slowly one time and hold. Loosen the front brake line connection at the master cylinder to purge air from the cylinder. Tighten the brake line and then slowly release the brake pedal. 4. After waiting fifteen seconds, repeat the process, including the fifteen second wait, until all air is purged from the forward end of master cylinder. Repeat process for rear brake line connection(s). MANUAL BLEEDING 1. Depressurize ABS system (if equipped). Fill master cylinder. Install bleeder hose to first bleeder valve to be serviced. Bleeding sequence is RR, LF, LR, RF. Place other end of hose in clean glass jar partially filled with clean brake fluid so end of hose is submerged in fluid. WARNING: ABS systems are under high pressure under normal operating conditions. Before opening the fluid reservoir or before servicing any component of an ABS system, it is mandatory that system pressure be discharged. To discharge system, turn ignition off and pump brake pedal a minimum of 20-25 times using full pedal strokes. When a definite increase in pedal effort is felt, pump pedal 2 more times. NOTE: If master cylinder requires bleeding, it must be done with master cylinder installed on vehicle. NOTE: Before bleeding system, exhaust all vacuum from power unit by depressing brake pedal several times. Bleed master cylinder if equipped with bleed screws, then bleed wheel cylinders or calipers in sequence. 2. Depress brake pedal slowly through its full travel. Open bleeder valve 3/4-1 turn. Close bleeder valve. Release pedal. Repeat procedure until flow of fluid shows no signs of air bubbles. PRESSURE BLEEDING 1. Depressurize ABS system (if equipped). Clean master cylinder cap and surrounding area, then remove cap. With pressure tank at least 1/3 full, connect to master cylinder using adapters. See Fig. 1. Attach bleeder hose to first bleeder valve to be serviced. Bleeding sequence is RR, LF, LR, RF. Place other end of hose in clean glass jar partially filled with clean brake fluid so end of hose is submerged in fluid. 2. Open release valve on pressure bleeder. Unscrew valve 3/4-1 turn noting fluid flow. When fluid flowing from cylinder to cup is free of bubbles, close bleeder valve securely. Bleed remaining cylinders in correct sequence and in same manner. Remove tool from combination valve. Fig. 1: Pressure Bleeder Installation (Typical) BLEEDING PRESSURES PRESSURE BLEEDING SPECIFICATIONS BLEEDING SEQUENCE BLEEDING SEQUENCE ADJUSTMENTS DISC BRAKE Disc brakes are self-adjusting. Caliper piston seals are designed to retract pistons just enough to allow brake lining to lightly brush disc without any drag. Sliding caliper design compensates for any lining wear. NOTE: Check fluid level in master cylinder frequently during bleeding to insure air does not enter system. NOTE: Before bleeding system, exhaust all vacuum from power unit by depressing brake pedal several times. Bleed master cylinder if equipped with bleed screws, then bleed wheel cylinders or calipers in sequence. Application Psi (kg/cm 2 ) All Models 20-25 (1.40-1.75) Application Sequence All Models RR, LF, LR, RF DRUM BRAKE To adjust brakes after service, apply and release brake pedal a minimum of 25 times. Repeat procedure until clicking sound can no longer be heard from rear brakes. Brakes will now be properly adjusted. NOTE: Adjustment should only be required after relining or replacing shoes, or if length of adjusting screw is changed.

Hi guys. Pardon me for jumping in here but there's an easy fix for this problem. It's true the answers might be right from a text book or service manual but that's the best way to insure the correct procedure is presented without omitting any important steps. Took merlin2021 a long time to type that too.

Here's a copy / paste version I've used many times for this problem:

On GM vehicles with the step bore master cylinder, imagine a teeter totter that is level, but if it moves one way, it will block the ports for two wheels. The teeter totter moves when one hydraulic circuit builds pressure and the other one doesn't due to a leak or from pedal-bleeding the system. As soon as the pedal is pressed while a bleeder screw is open, the teeter totter moves to block the ports for one front brake and the opposite rear brake. No fluid can be forced out of those two bleeders.

If the system is left like this, one front brake will wear out very quickly and the other side will look like new. People usually ask for advice when they run into worn pads on one wheel for the second or third time. The car will usually not have a brake pull because alignment angles are modified to accommodate loss of one hydraulic circuit on the split-diagonal systems.

The only way I ever found to reset the valve in the master cylinder, (that teeter totter), was to give a quick, short burst of compressed air to one of the bleeder screws that isn't flowing. Don't use so much air that it makes its way up to the master cylinder. A fraction of a second is sufficient. After that, just let it gravity bleed.

The same problem can happen even when the hydraulic system wasn't opened. After installing new front pads, the pistons must be worked out until the pads contact the rotors. One piston will always move first, then, once contact is made with the rotor, pressure will start to build up. That will trip the valve at which point the other piston will never move. Once the burst of air is given and the line gravity bleeds, pressing the pedal no more than half way to the floor will prevent the valve from tripping again.

This same master cylinder can be used with the factory "add-on" ABS system that is bolted directly to the ports of the master cylinder.

Even with normal master cylinders, you should never press the brake pedal more than half way to the floor when pedal bleeding. The lip seals will be torn on the debris and corrosion that build up in the lower half of the bores where they don't normally travel.

Caradiodoc

I would have elaborated more in my previous reply but I had visitors show up. The two blocked lines are real common. Don't go chasing non-existent problems. Just give a short "enema" of compressed air to one of the wheels that isn't bleeding, then let them all gravity-bleed. When fluid starts dripping from one wheel, close the bleeder screw and do the same as each other one starts to bleed. Once all four have bled, pump the brake pedal no more than half way to the floor to push the front pistons out. Once the pads contact the rotors on both sides, you can press the pedal like normal because at that point, both sides will build pressure equally and that valve in the master cylinder will not trip.

To aid in gravity-bleeding, the cover on the reservoir should be loose to allow air in to displace the fluid that is leaving, otherwise a vacuum can build up that prevents the fluid from going down to the wheels. I like to leave the cover on loosely because brake fluid loves to suck moisture out of the air which reduces its boiling point and promotes corrosion of metal parts.

Again, I apologize for butting into an ongoing conversation, but I know how frustrating it can be when you can't figure out the answer. This is so common. Just give it a squirt of air and walk away for a few minutes.

Caradiodoc

Dandy news. Happy I could help. You don't have to shoot air into the rear. It is sufficient to do it to either one one of the wheels that don't bleed.

I always told my students to never push any brake pedal all the way to the floor, simply because of the corrosion that builds up. The exception would be for a new master cylinder that hasn't had time yet to build up corrosion. One fellow told me off for suggesting his master cylinder was ruined by doing that. He said he had been doing brakes professionally for many years and always pushed the pedal to the floor and never had a problem. 90 percent of the time he might get lucky but it only takes one destroyed master cylinder to ruin your day. Keep in mind too that many of the procedures written in the service manuals pertain to vehicles new enough to still be under warranty. You'll rarely see a paragraph about what to do about rusty parts. Someone should write a book about how to fix old rusty / corroded / jammed / cross-threaded, ... You get the idea. Also, since this is such a common problem, why isn't it mentioned in the service manual?

Caradiodoc

With a collapsed brake hose, uneven pads wear should have been present, and a locked up caliper. This is easily checked by opening the bleeder, if the wheel spins free the hose is no good, if it stays locked, the caliper is no good. None of this was in the post? Glad it's solved, but my cut and paste answer after my gravity bleed method, is for Electra, both ABS and non ABS.

You are welcome! Any further assistance, don't hesitate to ask!